Operator norm on the space of continuous multilinear maps #
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When f is a continuous multilinear map in finitely many variables, we define its norm ‖f‖ as the
smallest number such that ‖f m‖ ≤ ‖f‖ * ∏ i, ‖m i‖ for all m.
We show that it is indeed a norm, and prove its basic properties.
Main results #
Let f be a multilinear map in finitely many variables.
exists_bound_of_continuousasserts that, iffis continuous, then there existsC > 0with‖f m‖ ≤ C * ∏ i, ‖m i‖for allm.continuous_of_bound, conversely, asserts that this bound implies continuity.mk_continuousconstructs the associated continuous multilinear map.
Let f be a continuous multilinear map in finitely many variables.
‖f‖is its norm, i.e., the smallest number such that‖f m‖ ≤ ‖f‖ * ∏ i, ‖m i‖for allm.le_op_norm f masserts the fundamental inequality‖f m‖ ≤ ‖f‖ * ∏ i, ‖m i‖.norm_image_sub_le f m₁ m₂gives a control of the differencef m₁ - f m₂in terms of‖f‖and‖m₁ - m₂‖.
We also register isomorphisms corresponding to currying or uncurrying variables, transforming a
continuous multilinear function f in n+1 variables into a continuous linear function taking
values in continuous multilinear functions in n variables, and also into a continuous multilinear
function in n variables taking values in continuous linear functions. These operations are called
f.curry_left and f.curry_right respectively (with inverses f.uncurry_left and
f.uncurry_right). They induce continuous linear equivalences between spaces of
continuous multilinear functions in n+1 variables and spaces of continuous linear functions into
continuous multilinear functions in n variables (resp. continuous multilinear functions in n
variables taking values in continuous linear functions), called respectively
continuous_multilinear_curry_left_equiv and continuous_multilinear_curry_right_equiv.
Implementation notes #
We mostly follow the API (and the proofs) of operator_norm.lean, with the additional complexity
that we should deal with multilinear maps in several variables. The currying/uncurrying
constructions are based on those in multilinear.lean.
From the mathematical point of view, all the results follow from the results on operator norm in
one variable, by applying them to one variable after the other through currying. However, this
is only well defined when there is an order on the variables (for instance on fin n) although
the final result is independent of the order. While everything could be done following this
approach, it turns out that direct proofs are easier and more efficient.
Type variables #
We use the following type variables in this file:
𝕜: anontrivially_normed_field;ι,ι': finite index types with decidable equality;E,E₁: families of normed vector spaces over𝕜indexed byi : ι;E': a family of normed vector spaces over𝕜indexed byi' : ι';Ei: a family of normed vector spaces over𝕜indexed byi : fin (nat.succ n);G,G': normed vector spaces over𝕜.
Continuity properties of multilinear maps #
We relate continuity of multilinear maps to the inequality ‖f m‖ ≤ C * ∏ i, ‖m i‖, in
both directions. Along the way, we prove useful bounds on the difference ‖f m₁ - f m₂‖.
theorem
multilinear_map.bound_of_shell
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : multilinear_map 𝕜 E G)
{ε : ι → ℝ}
{C : ℝ}
(hε : ∀ (i : ι), 0 < ε i)
{c : ι → 𝕜}
(hc : ∀ (i : ι), 1 < ‖c i‖)
(hf : ∀ (m : Π (i : ι), E i), (∀ (i : ι), ε i / ‖c i‖ ≤ ‖m i‖) → (∀ (i : ι), ‖m i‖ < ε i) → ‖⇑f m‖ ≤ C * finset.univ.prod (λ (i : ι), ‖m i‖))
(m : Π (i : ι), E i) :
If a multilinear map in finitely many variables on normed spaces satisfies the inequality
‖f m‖ ≤ C * ∏ i, ‖m i‖ on a shell ε i / ‖c i‖ < ‖m i‖ < ε i for some positive numbers ε i
and elements c i : 𝕜, 1 < ‖c i‖, then it satisfies this inequality for all m.
theorem
multilinear_map.exists_bound_of_continuous
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : multilinear_map 𝕜 E G)
(hf : continuous ⇑f) :
If a multilinear map in finitely many variables on normed spaces is continuous, then it
satisfies the inequality ‖f m‖ ≤ C * ∏ i, ‖m i‖, for some C which can be chosen to be
positive.
theorem
multilinear_map.norm_image_sub_le_of_bound'
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : multilinear_map 𝕜 E G)
[decidable_eq ι]
{C : ℝ}
(hC : 0 ≤ C)
(H : ∀ (m : Π (i : ι), E i), ‖⇑f m‖ ≤ C * finset.univ.prod (λ (i : ι), ‖m i‖))
(m₁ m₂ : Π (i : ι), E i) :
If f satisfies a boundedness property around 0, one can deduce a bound on f m₁ - f m₂
using the multilinearity. Here, we give a precise but hard to use version. See
norm_image_sub_le_of_bound for a less precise but more usable version. The bound reads
‖f m - f m'‖ ≤ C * ‖m 1 - m' 1‖ * max ‖m 2‖ ‖m' 2‖ * max ‖m 3‖ ‖m' 3‖ * ... * max ‖m n‖ ‖m' n‖ + ...,
where the other terms in the sum are the same products where 1 is replaced by any i.
theorem
multilinear_map.norm_image_sub_le_of_bound
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : multilinear_map 𝕜 E G)
{C : ℝ}
(hC : 0 ≤ C)
(H : ∀ (m : Π (i : ι), E i), ‖⇑f m‖ ≤ C * finset.univ.prod (λ (i : ι), ‖m i‖))
(m₁ m₂ : Π (i : ι), E i) :
If f satisfies a boundedness property around 0, one can deduce a bound on f m₁ - f m₂
using the multilinearity. Here, we give a usable but not very precise version. See
norm_image_sub_le_of_bound' for a more precise but less usable version. The bound is
‖f m - f m'‖ ≤ C * card ι * ‖m - m'‖ * (max ‖m‖ ‖m'‖) ^ (card ι - 1).
theorem
multilinear_map.continuous_of_bound
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : multilinear_map 𝕜 E G)
(C : ℝ)
(H : ∀ (m : Π (i : ι), E i), ‖⇑f m‖ ≤ C * finset.univ.prod (λ (i : ι), ‖m i‖)) :
If a multilinear map satisfies an inequality ‖f m‖ ≤ C * ∏ i, ‖m i‖, then it is
continuous.
def
multilinear_map.mk_continuous
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : multilinear_map 𝕜 E G)
(C : ℝ)
(H : ∀ (m : Π (i : ι), E i), ‖⇑f m‖ ≤ C * finset.univ.prod (λ (i : ι), ‖m i‖)) :
Constructing a continuous multilinear map from a multilinear map satisfying a boundedness condition.
Equations
- f.mk_continuous C H = {to_multilinear_map := {to_fun := f.to_fun, map_add' := _, map_smul' := _}, cont := _}
@[simp]
theorem
multilinear_map.coe_mk_continuous
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : multilinear_map 𝕜 E G)
(C : ℝ)
(H : ∀ (m : Π (i : ι), E i), ‖⇑f m‖ ≤ C * finset.univ.prod (λ (i : ι), ‖m i‖)) :
⇑(f.mk_continuous C H) = ⇑f
theorem
multilinear_map.restr_norm_le
{𝕜 : Type u}
{G : Type wG}
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
{k n : ℕ}
(f : multilinear_map 𝕜 (λ (i : fin n), G) G')
(s : finset (fin n))
(hk : s.card = k)
(z : G)
{C : ℝ}
(H : ∀ (m : fin n → G), ‖⇑f m‖ ≤ C * finset.univ.prod (λ (i : fin n), ‖m i‖))
(v : fin k → G) :
Given a multilinear map in n variables, if one restricts it to k variables putting z on
the other coordinates, then the resulting restricted function satisfies an inequality
‖f.restr v‖ ≤ C * ‖z‖^(n-k) * Π ‖v i‖ if the original function satisfies ‖f v‖ ≤ C * Π ‖v i‖.
Continuous multilinear maps #
We define the norm ‖f‖ of a continuous multilinear map f in finitely many variables as the
smallest number such that ‖f m‖ ≤ ‖f‖ * ∏ i, ‖m i‖ for all m. We show that this
defines a normed space structure on continuous_multilinear_map 𝕜 E G.
theorem
continuous_multilinear_map.bound
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 E G) :
noncomputable
def
continuous_multilinear_map.op_norm
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 E G) :
The operator norm of a continuous multilinear map is the inf of all its bounds.
@[protected, instance]
noncomputable
def
continuous_multilinear_map.has_op_norm
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G] :
has_norm (continuous_multilinear_map 𝕜 E G)
Equations
@[protected, instance]
noncomputable
def
continuous_multilinear_map.has_op_norm'
{𝕜 : Type u}
{ι : Type v}
{G : Type wG}
{G' : Type wG'}
[fintype ι]
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G'] :
has_norm (continuous_multilinear_map 𝕜 (λ (i : ι), G) G')
An alias of continuous_multilinear_map.has_op_norm with non-dependent types to help typeclass
search.
theorem
continuous_multilinear_map.norm_def
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 E G) :
theorem
continuous_multilinear_map.bounds_nonempty
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
{f : continuous_multilinear_map 𝕜 E G} :
theorem
continuous_multilinear_map.bounds_bdd_below
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
{f : continuous_multilinear_map 𝕜 E G} :
theorem
continuous_multilinear_map.op_norm_nonneg
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 E G) :
theorem
continuous_multilinear_map.le_op_norm
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 E G)
(m : Π (i : ι), E i) :
The fundamental property of the operator norm of a continuous multilinear map:
‖f m‖ is bounded by ‖f‖ times the product of the ‖m i‖.
theorem
continuous_multilinear_map.le_of_op_norm_le
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 E G)
(m : Π (i : ι), E i)
{C : ℝ}
(h : ‖f‖ ≤ C) :
theorem
continuous_multilinear_map.ratio_le_op_norm
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 E G)
(m : Π (i : ι), E i) :
theorem
continuous_multilinear_map.unit_le_op_norm
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 E G)
(m : Π (i : ι), E i)
(h : ‖m‖ ≤ 1) :
The image of the unit ball under a continuous multilinear map is bounded.
theorem
continuous_multilinear_map.op_norm_le_bound
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 E G)
{M : ℝ}
(hMp : 0 ≤ M)
(hM : ∀ (m : Π (i : ι), E i), ‖⇑f m‖ ≤ M * finset.univ.prod (λ (i : ι), ‖m i‖)) :
If one controls the norm of every f x, then one controls the norm of f.
theorem
continuous_multilinear_map.op_norm_add_le
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f g : continuous_multilinear_map 𝕜 E G) :
The operator norm satisfies the triangle inequality.
theorem
continuous_multilinear_map.op_norm_zero
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G] :
theorem
continuous_multilinear_map.op_norm_zero_iff
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 E G) :
A continuous linear map is zero iff its norm vanishes.
theorem
continuous_multilinear_map.op_norm_smul_le
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 E G)
{𝕜' : Type u_1}
[normed_field 𝕜']
[normed_space 𝕜' G]
[smul_comm_class 𝕜 𝕜' G]
(c : 𝕜') :
theorem
continuous_multilinear_map.op_norm_neg
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 E G) :
@[protected, instance]
noncomputable
def
continuous_multilinear_map.normed_add_comm_group
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G] :
Continuous multilinear maps themselves form a normed space with respect to the operator norm.
Equations
@[protected, instance]
noncomputable
def
continuous_multilinear_map.normed_add_comm_group'
{𝕜 : Type u}
{ι : Type v}
{G : Type wG}
{G' : Type wG'}
[fintype ι]
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G'] :
normed_add_comm_group (continuous_multilinear_map 𝕜 (λ (i : ι), G) G')
An alias of continuous_multilinear_map.normed_add_comm_group with non-dependent types to help
typeclass search.
@[protected, instance]
def
continuous_multilinear_map.normed_space
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
{𝕜' : Type u_1}
[normed_field 𝕜']
[normed_space 𝕜' G]
[smul_comm_class 𝕜 𝕜' G] :
normed_space 𝕜' (continuous_multilinear_map 𝕜 E G)
Equations
@[protected, instance]
def
continuous_multilinear_map.normed_space'
{𝕜 : Type u}
{ι : Type v}
{G : Type wG}
{G' : Type wG'}
[fintype ι]
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
{𝕜' : Type u_1}
[normed_field 𝕜']
[normed_space 𝕜' G]
[smul_comm_class 𝕜 𝕜' G] :
normed_space 𝕜' (continuous_multilinear_map 𝕜 (λ (i : ι), G') G)
An alias of continuous_multilinear_map.normed_space with non-dependent types to help typeclass
search.
theorem
continuous_multilinear_map.le_op_norm_mul_prod_of_le
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 E G)
(m : Π (i : ι), E i)
{b : ι → ℝ}
(hm : ∀ (i : ι), ‖m i‖ ≤ b i) :
theorem
continuous_multilinear_map.le_op_norm_mul_pow_card_of_le
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 E G)
(m : Π (i : ι), E i)
{b : ℝ}
(hm : ∀ (i : ι), ‖m i‖ ≤ b) :
theorem
continuous_multilinear_map.le_op_norm_mul_pow_of_le
{𝕜 : Type u}
{n : ℕ}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
{Ei : fin n → Type u_1}
[Π (i : fin n), normed_add_comm_group (Ei i)]
[Π (i : fin n), normed_space 𝕜 (Ei i)]
(f : continuous_multilinear_map 𝕜 Ei G)
(m : Π (i : fin n), Ei i)
{b : ℝ}
(hm : ‖m‖ ≤ b) :
theorem
continuous_multilinear_map.le_op_nnnorm
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 E G)
(m : Π (i : ι), E i) :
The fundamental property of the operator norm of a continuous multilinear map:
‖f m‖ is bounded by ‖f‖ times the product of the ‖m i‖, nnnorm version.
theorem
continuous_multilinear_map.le_of_op_nnnorm_le
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 E G)
(m : Π (i : ι), E i)
{C : nnreal}
(h : ‖f‖₊ ≤ C) :
theorem
continuous_multilinear_map.op_norm_prod
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
{G' : Type wG'}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(f : continuous_multilinear_map 𝕜 E G)
(g : continuous_multilinear_map 𝕜 E G') :
theorem
continuous_multilinear_map.norm_pi
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
{ι' : Type v'}
[fintype ι']
{E' : ι' → Type wE'}
[Π (i' : ι'), normed_add_comm_group (E' i')]
[Π (i' : ι'), normed_space 𝕜 (E' i')]
(f : Π (i' : ι'), continuous_multilinear_map 𝕜 E (E' i')) :
theorem
continuous_multilinear_map.norm_of_subsingleton_le
(𝕜 : Type u)
{ι : Type v}
(G : Type wG)
[fintype ι]
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[subsingleton ι]
(i' : ι) :
@[simp]
theorem
continuous_multilinear_map.norm_of_subsingleton
(𝕜 : Type u)
{ι : Type v}
(G : Type wG)
[fintype ι]
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[subsingleton ι]
[nontrivial G]
(i' : ι) :
theorem
continuous_multilinear_map.nnnorm_of_subsingleton_le
(𝕜 : Type u)
{ι : Type v}
(G : Type wG)
[fintype ι]
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[subsingleton ι]
(i' : ι) :
@[simp]
theorem
continuous_multilinear_map.nnnorm_of_subsingleton
(𝕜 : Type u)
{ι : Type v}
(G : Type wG)
[fintype ι]
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[subsingleton ι]
[nontrivial G]
(i' : ι) :
@[simp]
theorem
continuous_multilinear_map.norm_const_of_is_empty
(𝕜 : Type u)
{ι : Type v}
(E : ι → Type wE)
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[is_empty ι]
(x : G) :
@[simp]
theorem
continuous_multilinear_map.nnnorm_const_of_is_empty
(𝕜 : Type u)
{ι : Type v}
(E : ι → Type wE)
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[is_empty ι]
(x : G) :
def
continuous_multilinear_map.prodL
(𝕜 : Type u)
{ι : Type v}
(E : ι → Type wE)
(G : Type wG)
(G' : Type wG')
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G'] :
continuous_multilinear_map 𝕜 E G × continuous_multilinear_map 𝕜 E G' ≃ₗᵢ[𝕜] continuous_multilinear_map 𝕜 E (G × G')
continuous_multilinear_map.prod as a linear_isometry_equiv.
Equations
- continuous_multilinear_map.prodL 𝕜 E G G' = {to_linear_equiv := {to_fun := λ (f : continuous_multilinear_map 𝕜 E G × continuous_multilinear_map 𝕜 E G'), f.fst.prod f.snd, map_add' := _, map_smul' := _, inv_fun := λ (f : continuous_multilinear_map 𝕜 E (G × G')), ((continuous_linear_map.fst 𝕜 G G').comp_continuous_multilinear_map f, (continuous_linear_map.snd 𝕜 G G').comp_continuous_multilinear_map f), left_inv := _, right_inv := _}, norm_map' := _}
def
continuous_multilinear_map.piₗᵢ
(𝕜 : Type u)
{ι : Type v}
(E : ι → Type wE)
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
{ι' : Type v'}
[fintype ι']
{E' : ι' → Type wE'}
[Π (i' : ι'), normed_add_comm_group (E' i')]
[Π (i' : ι'), normed_space 𝕜 (E' i')] :
(Π (i' : ι'), continuous_multilinear_map 𝕜 E (E' i')) ≃ₗᵢ[𝕜] continuous_multilinear_map 𝕜 E (Π (i : ι'), E' i)
continuous_multilinear_map.pi as a linear_isometry_equiv.
Equations
- continuous_multilinear_map.piₗᵢ 𝕜 E = {to_linear_equiv := {to_fun := continuous_multilinear_map.pi_equiv.to_fun, map_add' := _, map_smul' := _, inv_fun := continuous_multilinear_map.pi_equiv.inv_fun, left_inv := _, right_inv := _}, norm_map' := _}
@[simp]
theorem
continuous_multilinear_map.norm_restrict_scalars
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 E G)
{𝕜' : Type u_1}
[nontrivially_normed_field 𝕜']
[normed_algebra 𝕜' 𝕜]
[normed_space 𝕜' G]
[is_scalar_tower 𝕜' 𝕜 G]
[Π (i : ι), normed_space 𝕜' (E i)]
[∀ (i : ι), is_scalar_tower 𝕜' 𝕜 (E i)] :
def
continuous_multilinear_map.restrict_scalarsₗᵢ
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(𝕜' : Type u_1)
[nontrivially_normed_field 𝕜']
[normed_algebra 𝕜' 𝕜]
[normed_space 𝕜' G]
[is_scalar_tower 𝕜' 𝕜 G]
[Π (i : ι), normed_space 𝕜' (E i)]
[∀ (i : ι), is_scalar_tower 𝕜' 𝕜 (E i)] :
continuous_multilinear_map 𝕜 E G →ₗᵢ[𝕜'] continuous_multilinear_map 𝕜' E G
continuous_multilinear_map.restrict_scalars as a linear_isometry.
Equations
- continuous_multilinear_map.restrict_scalarsₗᵢ 𝕜' = {to_linear_map := {to_fun := continuous_multilinear_map.restrict_scalars 𝕜' _inst_19, map_add' := _, map_smul' := _}, norm_map' := _}
noncomputable
def
continuous_multilinear_map.restrict_scalars_linear
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(𝕜' : Type u_1)
[nontrivially_normed_field 𝕜']
[normed_algebra 𝕜' 𝕜]
[normed_space 𝕜' G]
[is_scalar_tower 𝕜' 𝕜 G]
[Π (i : ι), normed_space 𝕜' (E i)]
[∀ (i : ι), is_scalar_tower 𝕜' 𝕜 (E i)] :
continuous_multilinear_map 𝕜 E G →L[𝕜'] continuous_multilinear_map 𝕜' E G
continuous_multilinear_map.restrict_scalars as a continuous_linear_map.
theorem
continuous_multilinear_map.continuous_restrict_scalars
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
{𝕜' : Type u_1}
[nontrivially_normed_field 𝕜']
[normed_algebra 𝕜' 𝕜]
[normed_space 𝕜' G]
[is_scalar_tower 𝕜' 𝕜 G]
[Π (i : ι), normed_space 𝕜' (E i)]
[∀ (i : ι), is_scalar_tower 𝕜' 𝕜 (E i)] :
theorem
continuous_multilinear_map.norm_image_sub_le'
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 E G)
[decidable_eq ι]
(m₁ m₂ : Π (i : ι), E i) :
The difference f m₁ - f m₂ is controlled in terms of ‖f‖ and ‖m₁ - m₂‖, precise version.
For a less precise but more usable version, see norm_image_sub_le. The bound reads
‖f m - f m'‖ ≤ ‖f‖ * ‖m 1 - m' 1‖ * max ‖m 2‖ ‖m' 2‖ * max ‖m 3‖ ‖m' 3‖ * ... * max ‖m n‖ ‖m' n‖ + ...,
where the other terms in the sum are the same products where 1 is replaced by any i.
theorem
continuous_multilinear_map.norm_image_sub_le
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 E G)
(m₁ m₂ : Π (i : ι), E i) :
The difference f m₁ - f m₂ is controlled in terms of ‖f‖ and ‖m₁ - m₂‖, less precise
version. For a more precise but less usable version, see norm_image_sub_le'.
The bound is ‖f m - f m'‖ ≤ ‖f‖ * card ι * ‖m - m'‖ * (max ‖m‖ ‖m'‖) ^ (card ι - 1).
theorem
continuous_multilinear_map.continuous_eval
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G] :
continuous (λ (p : continuous_multilinear_map 𝕜 E G × Π (i : ι), E i), ⇑(p.fst) p.snd)
Applying a multilinear map to a vector is continuous in both coordinates.
theorem
continuous_multilinear_map.continuous_eval_left
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(m : Π (i : ι), E i) :
continuous (λ (p : continuous_multilinear_map 𝕜 E G), ⇑p m)
theorem
continuous_multilinear_map.has_sum_eval
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
{α : Type u_1}
{p : α → continuous_multilinear_map 𝕜 E G}
{q : continuous_multilinear_map 𝕜 E G}
(h : has_sum p q)
(m : Π (i : ι), E i) :
theorem
continuous_multilinear_map.tsum_eval
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
{α : Type u_1}
{p : α → continuous_multilinear_map 𝕜 E G}
(hp : summable p)
(m : Π (i : ι), E i) :
@[protected, instance]
def
continuous_multilinear_map.complete_space
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[complete_space G] :
If the target space is complete, the space of continuous multilinear maps with its norm is also
complete. The proof is essentially the same as for the space of continuous linear maps (modulo the
addition of finset.prod where needed. The duplication could be avoided by deducing the linear
case from the multilinear case via a currying isomorphism. However, this would mess up imports,
and it is more satisfactory to have the simplest case as a standalone proof.
theorem
multilinear_map.mk_continuous_norm_le
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : multilinear_map 𝕜 E G)
{C : ℝ}
(hC : 0 ≤ C)
(H : ∀ (m : Π (i : ι), E i), ‖⇑f m‖ ≤ C * finset.univ.prod (λ (i : ι), ‖m i‖)) :
‖f.mk_continuous C H‖ ≤ C
If a continuous multilinear map is constructed from a multilinear map via the constructor
mk_continuous, then its norm is bounded by the bound given to the constructor if it is
nonnegative.
theorem
multilinear_map.mk_continuous_norm_le'
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : multilinear_map 𝕜 E G)
{C : ℝ}
(H : ∀ (m : Π (i : ι), E i), ‖⇑f m‖ ≤ C * finset.univ.prod (λ (i : ι), ‖m i‖)) :
‖f.mk_continuous C H‖ ≤ linear_order.max C 0
If a continuous multilinear map is constructed from a multilinear map via the constructor
mk_continuous, then its norm is bounded by the bound given to the constructor if it is
nonnegative.
noncomputable
def
continuous_multilinear_map.restr
{𝕜 : Type u}
{G : Type wG}
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
{k n : ℕ}
(f : continuous_multilinear_map 𝕜 (λ (i : fin n), G) G')
(s : finset (fin n))
(hk : s.card = k)
(z : G) :
continuous_multilinear_map 𝕜 (λ (i : fin k), G) G'
Given a continuous multilinear map f on n variables (parameterized by fin n) and a subset
s of k of these variables, one gets a new continuous multilinear map on fin k by varying
these variables, and fixing the other ones equal to a given value z. It is denoted by
f.restr s hk z, where hk is a proof that the cardinality of s is k. The implicit
identification between fin k and s that we use is the canonical (increasing) bijection.
theorem
continuous_multilinear_map.norm_restr
{𝕜 : Type u}
{G : Type wG}
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
{k n : ℕ}
(f : continuous_multilinear_map 𝕜 (λ (i : fin n), G) G')
(s : finset (fin n))
(hk : s.card = k)
(z : G) :
@[simp]
theorem
continuous_multilinear_map.norm_mk_pi_algebra_le
{𝕜 : Type u}
{ι : Type v}
[fintype ι]
[nontrivially_normed_field 𝕜]
{A : Type u_1}
[normed_comm_ring A]
[normed_algebra 𝕜 A]
[nonempty ι] :
theorem
continuous_multilinear_map.norm_mk_pi_algebra_of_empty
{𝕜 : Type u}
{ι : Type v}
[fintype ι]
[nontrivially_normed_field 𝕜]
{A : Type u_1}
[normed_comm_ring A]
[normed_algebra 𝕜 A]
[is_empty ι] :
@[simp]
theorem
continuous_multilinear_map.norm_mk_pi_algebra
{𝕜 : Type u}
{ι : Type v}
[fintype ι]
[nontrivially_normed_field 𝕜]
{A : Type u_1}
[normed_comm_ring A]
[normed_algebra 𝕜 A]
[norm_one_class A] :
theorem
continuous_multilinear_map.norm_mk_pi_algebra_fin_succ_le
{𝕜 : Type u}
{n : ℕ}
[nontrivially_normed_field 𝕜]
{A : Type u_1}
[normed_ring A]
[normed_algebra 𝕜 A] :
theorem
continuous_multilinear_map.norm_mk_pi_algebra_fin_le_of_pos
{𝕜 : Type u}
{n : ℕ}
[nontrivially_normed_field 𝕜]
{A : Type u_1}
[normed_ring A]
[normed_algebra 𝕜 A]
(hn : 0 < n) :
theorem
continuous_multilinear_map.norm_mk_pi_algebra_fin_zero
{𝕜 : Type u}
[nontrivially_normed_field 𝕜]
{A : Type u_1}
[normed_ring A]
[normed_algebra 𝕜 A] :
@[simp]
theorem
continuous_multilinear_map.norm_mk_pi_algebra_fin
{𝕜 : Type u}
{n : ℕ}
[nontrivially_normed_field 𝕜]
{A : Type u_1}
[normed_ring A]
[normed_algebra 𝕜 A]
[norm_one_class A] :
@[protected]
def
continuous_multilinear_map.mk_pi_field
(𝕜 : Type u)
(ι : Type v)
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(z : G) :
continuous_multilinear_map 𝕜 (λ (i : ι), 𝕜) G
The canonical continuous multilinear map on 𝕜^ι, associating to m the product of all the
m i (multiplied by a fixed reference element z in the target module)
Equations
- continuous_multilinear_map.mk_pi_field 𝕜 ι z = (multilinear_map.mk_pi_ring 𝕜 ι z).mk_continuous ‖z‖ _
@[simp]
theorem
continuous_multilinear_map.mk_pi_field_apply
{𝕜 : Type u}
{ι : Type v}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(z : G)
(m : ι → 𝕜) :
⇑(continuous_multilinear_map.mk_pi_field 𝕜 ι z) m = finset.univ.prod (λ (i : ι), m i) • z
theorem
continuous_multilinear_map.mk_pi_field_apply_one_eq_self
{𝕜 : Type u}
{ι : Type v}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 (λ (i : ι), 𝕜) G) :
continuous_multilinear_map.mk_pi_field 𝕜 ι (⇑f (λ (i : ι), 1)) = f
@[simp]
theorem
continuous_multilinear_map.norm_mk_pi_field
{𝕜 : Type u}
{ι : Type v}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(z : G) :
theorem
continuous_multilinear_map.mk_pi_field_eq_iff
{𝕜 : Type u}
{ι : Type v}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
{z₁ z₂ : G} :
continuous_multilinear_map.mk_pi_field 𝕜 ι z₁ = continuous_multilinear_map.mk_pi_field 𝕜 ι z₂ ↔ z₁ = z₂
theorem
continuous_multilinear_map.mk_pi_field_zero
{𝕜 : Type u}
{ι : Type v}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G] :
theorem
continuous_multilinear_map.mk_pi_field_eq_zero_iff
{𝕜 : Type u}
{ι : Type v}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(z : G) :
continuous_multilinear_map.mk_pi_field 𝕜 ι z = 0 ↔ z = 0
@[protected]
def
continuous_multilinear_map.pi_field_equiv
(𝕜 : Type u)
(ι : Type v)
(G : Type wG)
[fintype ι]
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G] :
G ≃ₗᵢ[𝕜] continuous_multilinear_map 𝕜 (λ (i : ι), 𝕜) G
Continuous multilinear maps on 𝕜^n with values in G are in bijection with G, as such a
continuous multilinear map is completely determined by its value on the constant vector made of
ones. We register this bijection as a linear isometry in
continuous_multilinear_map.pi_field_equiv.
Equations
- continuous_multilinear_map.pi_field_equiv 𝕜 ι G = {to_linear_equiv := {to_fun := λ (z : G), continuous_multilinear_map.mk_pi_field 𝕜 ι z, map_add' := _, map_smul' := _, inv_fun := λ (f : continuous_multilinear_map 𝕜 (λ (i : ι), 𝕜) G), ⇑f (λ (i : ι), 1), left_inv := _, right_inv := _}, norm_map' := _}
theorem
continuous_linear_map.norm_comp_continuous_multilinear_map_le
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
{G' : Type wG'}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(g : G →L[𝕜] G')
(f : continuous_multilinear_map 𝕜 E G) :
noncomputable
def
continuous_linear_map.comp_continuous_multilinear_mapL
(𝕜 : Type u)
{ι : Type v}
(E : ι → Type wE)
(G : Type wG)
(G' : Type wG')
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G'] :
(G →L[𝕜] G') →L[𝕜] continuous_multilinear_map 𝕜 E G →L[𝕜] continuous_multilinear_map 𝕜 E G'
continuous_linear_map.comp_continuous_multilinear_map as a bundled continuous bilinear map.
Equations
noncomputable
def
continuous_linear_equiv.comp_continuous_multilinear_mapL
{𝕜 : Type u}
{ι : Type v}
(E : ι → Type wE)
{G : Type wG}
{G' : Type wG'}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(g : G ≃L[𝕜] G') :
continuous_multilinear_map 𝕜 E G ≃L[𝕜] continuous_multilinear_map 𝕜 E G'
continuous_linear_map.comp_continuous_multilinear_map as a bundled
continuous linear equiv.
Equations
- continuous_linear_equiv.comp_continuous_multilinear_mapL E g = {to_linear_equiv := {to_fun := (⇑(continuous_linear_map.comp_continuous_multilinear_mapL 𝕜 E G G') g.to_continuous_linear_map).to_linear_map.to_fun, map_add' := _, map_smul' := _, inv_fun := ⇑(⇑(continuous_linear_map.comp_continuous_multilinear_mapL 𝕜 E G' G) g.symm.to_continuous_linear_map), left_inv := _, right_inv := _}, continuous_to_fun := _, continuous_inv_fun := _}
@[simp]
theorem
continuous_linear_equiv.comp_continuous_multilinear_mapL_symm
{𝕜 : Type u}
{ι : Type v}
(E : ι → Type wE)
{G : Type wG}
{G' : Type wG'}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(g : G ≃L[𝕜] G') :
@[simp]
theorem
continuous_linear_equiv.comp_continuous_multilinear_mapL_apply
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
{G' : Type wG'}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(g : G ≃L[𝕜] G')
(f : continuous_multilinear_map 𝕜 E G) :
@[simp]
theorem
continuous_linear_map.flip_multilinear_apply_apply
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
{G' : Type wG'}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(f : G →L[𝕜] continuous_multilinear_map 𝕜 E G')
(ᾰ : Π (i : ι), E i)
(x : G) :
noncomputable
def
continuous_linear_map.flip_multilinear
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
{G' : Type wG'}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(f : G →L[𝕜] continuous_multilinear_map 𝕜 E G') :
continuous_multilinear_map 𝕜 E (G →L[𝕜] G')
Flip arguments in f : G →L[𝕜] continuous_multilinear_map 𝕜 E G' to get
continuous_multilinear_map 𝕜 E (G →L[𝕜] G')
theorem
linear_isometry.norm_comp_continuous_multilinear_map
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
{G' : Type wG'}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(g : G →ₗᵢ[𝕜] G')
(f : continuous_multilinear_map 𝕜 E G) :
noncomputable
def
multilinear_map.mk_continuous_linear
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
{G' : Type wG'}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(f : G →ₗ[𝕜] multilinear_map 𝕜 E G')
(C : ℝ)
(H : ∀ (x : G) (m : Π (i : ι), E i), ‖⇑(⇑f x) m‖ ≤ C * ‖x‖ * finset.univ.prod (λ (i : ι), ‖m i‖)) :
G →L[𝕜] continuous_multilinear_map 𝕜 E G'
Given a map f : G →ₗ[𝕜] multilinear_map 𝕜 E G' and an estimate
H : ∀ x m, ‖f x m‖ ≤ C * ‖x‖ * ∏ i, ‖m i‖, construct a continuous linear
map from G to continuous_multilinear_map 𝕜 E G'.
In order to lift, e.g., a map f : (multilinear_map 𝕜 E G) →ₗ[𝕜] multilinear_map 𝕜 E' G'
to a map (continuous_multilinear_map 𝕜 E G) →L[𝕜] continuous_multilinear_map 𝕜 E' G',
one can apply this construction to f.comp continuous_multilinear_map.to_multilinear_map_linear
which is a linear map from continuous_multilinear_map 𝕜 E G to multilinear_map 𝕜 E' G'.
Equations
- multilinear_map.mk_continuous_linear f C H = {to_fun := λ (x : G), (⇑f x).mk_continuous (C * ‖x‖) _, map_add' := _, map_smul' := _}.mk_continuous (linear_order.max C 0) _
theorem
multilinear_map.mk_continuous_linear_norm_le'
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
{G' : Type wG'}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(f : G →ₗ[𝕜] multilinear_map 𝕜 E G')
(C : ℝ)
(H : ∀ (x : G) (m : Π (i : ι), E i), ‖⇑(⇑f x) m‖ ≤ C * ‖x‖ * finset.univ.prod (λ (i : ι), ‖m i‖)) :
theorem
multilinear_map.mk_continuous_linear_norm_le
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
{G' : Type wG'}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(f : G →ₗ[𝕜] multilinear_map 𝕜 E G')
{C : ℝ}
(hC : 0 ≤ C)
(H : ∀ (x : G) (m : Π (i : ι), E i), ‖⇑(⇑f x) m‖ ≤ C * ‖x‖ * finset.univ.prod (λ (i : ι), ‖m i‖)) :
noncomputable
def
multilinear_map.mk_continuous_multilinear
{𝕜 : Type u}
{ι : Type v}
{ι' : Type v'}
{E : ι → Type wE}
{E' : ι' → Type wE'}
{G : Type wG}
[fintype ι]
[fintype ι']
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[Π (i : ι'), normed_add_comm_group (E' i)]
[Π (i : ι'), normed_space 𝕜 (E' i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : multilinear_map 𝕜 E (multilinear_map 𝕜 E' G))
(C : ℝ)
(H : ∀ (m₁ : Π (i : ι), E i) (m₂ : Π (i : ι'), E' i), ‖⇑(⇑f m₁) m₂‖ ≤ C * finset.univ.prod (λ (i : ι), ‖m₁ i‖) * finset.univ.prod (λ (i : ι'), ‖m₂ i‖)) :
continuous_multilinear_map 𝕜 E (continuous_multilinear_map 𝕜 E' G)
Given a map f : multilinear_map 𝕜 E (multilinear_map 𝕜 E' G) and an estimate
H : ∀ m m', ‖f m m'‖ ≤ C * ∏ i, ‖m i‖ * ∏ i, ‖m' i‖, upgrade all multilinear_maps in the type to
continuous_multilinear_maps.
Equations
- f.mk_continuous_multilinear C H = {to_fun := λ (m : Π (i : ι), E i), (⇑f m).mk_continuous (C * finset.univ.prod (λ (i : ι), ‖m i‖)) _, map_add' := _, map_smul' := _}.mk_continuous (linear_order.max C 0) _
@[simp]
theorem
multilinear_map.mk_continuous_multilinear_apply
{𝕜 : Type u}
{ι : Type v}
{ι' : Type v'}
{E : ι → Type wE}
{E' : ι' → Type wE'}
{G : Type wG}
[fintype ι]
[fintype ι']
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[Π (i : ι'), normed_add_comm_group (E' i)]
[Π (i : ι'), normed_space 𝕜 (E' i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : multilinear_map 𝕜 E (multilinear_map 𝕜 E' G))
{C : ℝ}
(H : ∀ (m₁ : Π (i : ι), E i) (m₂ : Π (i : ι'), E' i), ‖⇑(⇑f m₁) m₂‖ ≤ C * finset.univ.prod (λ (i : ι), ‖m₁ i‖) * finset.univ.prod (λ (i : ι'), ‖m₂ i‖))
(m : Π (i : ι), E i) :
theorem
multilinear_map.mk_continuous_multilinear_norm_le'
{𝕜 : Type u}
{ι : Type v}
{ι' : Type v'}
{E : ι → Type wE}
{E' : ι' → Type wE'}
{G : Type wG}
[fintype ι]
[fintype ι']
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[Π (i : ι'), normed_add_comm_group (E' i)]
[Π (i : ι'), normed_space 𝕜 (E' i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : multilinear_map 𝕜 E (multilinear_map 𝕜 E' G))
(C : ℝ)
(H : ∀ (m₁ : Π (i : ι), E i) (m₂ : Π (i : ι'), E' i), ‖⇑(⇑f m₁) m₂‖ ≤ C * finset.univ.prod (λ (i : ι), ‖m₁ i‖) * finset.univ.prod (λ (i : ι'), ‖m₂ i‖)) :
‖f.mk_continuous_multilinear C H‖ ≤ linear_order.max C 0
theorem
multilinear_map.mk_continuous_multilinear_norm_le
{𝕜 : Type u}
{ι : Type v}
{ι' : Type v'}
{E : ι → Type wE}
{E' : ι' → Type wE'}
{G : Type wG}
[fintype ι]
[fintype ι']
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[Π (i : ι'), normed_add_comm_group (E' i)]
[Π (i : ι'), normed_space 𝕜 (E' i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : multilinear_map 𝕜 E (multilinear_map 𝕜 E' G))
{C : ℝ}
(hC : 0 ≤ C)
(H : ∀ (m₁ : Π (i : ι), E i) (m₂ : Π (i : ι'), E' i), ‖⇑(⇑f m₁) m₂‖ ≤ C * finset.univ.prod (λ (i : ι), ‖m₁ i‖) * finset.univ.prod (λ (i : ι'), ‖m₂ i‖)) :
‖f.mk_continuous_multilinear C H‖ ≤ C
theorem
continuous_multilinear_map.norm_comp_continuous_linear_le
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{E₁ : ι → Type wE₁}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[Π (i : ι), normed_add_comm_group (E₁ i)]
[Π (i : ι), normed_space 𝕜 (E₁ i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(g : continuous_multilinear_map 𝕜 E₁ G)
(f : Π (i : ι), E i →L[𝕜] E₁ i) :
theorem
continuous_multilinear_map.norm_comp_continuous_linear_isometry_le
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{E₁ : ι → Type wE₁}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[Π (i : ι), normed_add_comm_group (E₁ i)]
[Π (i : ι), normed_space 𝕜 (E₁ i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(g : continuous_multilinear_map 𝕜 E₁ G)
(f : Π (i : ι), E i →ₗᵢ[𝕜] E₁ i) :
‖g.comp_continuous_linear_map (λ (i : ι), (f i).to_continuous_linear_map)‖ ≤ ‖g‖
theorem
continuous_multilinear_map.norm_comp_continuous_linear_isometry_equiv
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{E₁ : ι → Type wE₁}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[Π (i : ι), normed_add_comm_group (E₁ i)]
[Π (i : ι), normed_space 𝕜 (E₁ i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(g : continuous_multilinear_map 𝕜 E₁ G)
(f : Π (i : ι), E i ≃ₗᵢ[𝕜] E₁ i) :
noncomputable
def
continuous_multilinear_map.comp_continuous_linear_mapL
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{E₁ : ι → Type wE₁}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[Π (i : ι), normed_add_comm_group (E₁ i)]
[Π (i : ι), normed_space 𝕜 (E₁ i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : Π (i : ι), E i →L[𝕜] E₁ i) :
continuous_multilinear_map 𝕜 E₁ G →L[𝕜] continuous_multilinear_map 𝕜 E G
continuous_multilinear_map.comp_continuous_linear_map as a bundled continuous linear map.
This implementation fixes f : Π i, E i →L[𝕜] E₁ i.
TODO: Actually, the map is multilinear in f but an attempt to formalize this failed because of
issues with class instances.
Equations
- continuous_multilinear_map.comp_continuous_linear_mapL f = {to_fun := λ (g : continuous_multilinear_map 𝕜 E₁ G), g.comp_continuous_linear_map f, map_add' := _, map_smul' := _}.mk_continuous (finset.univ.prod (λ (i : ι), ‖f i‖)) _
@[simp]
theorem
continuous_multilinear_map.comp_continuous_linear_mapL_apply
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{E₁ : ι → Type wE₁}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[Π (i : ι), normed_add_comm_group (E₁ i)]
[Π (i : ι), normed_space 𝕜 (E₁ i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(g : continuous_multilinear_map 𝕜 E₁ G)
(f : Π (i : ι), E i →L[𝕜] E₁ i) :
theorem
continuous_multilinear_map.norm_comp_continuous_linear_mapL_le
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{E₁ : ι → Type wE₁}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[Π (i : ι), normed_add_comm_group (E₁ i)]
[Π (i : ι), normed_space 𝕜 (E₁ i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : Π (i : ι), E i →L[𝕜] E₁ i) :
‖continuous_multilinear_map.comp_continuous_linear_mapL f‖ ≤ finset.univ.prod (λ (i : ι), ‖f i‖)
noncomputable
def
continuous_multilinear_map.comp_continuous_linear_map_equivL
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{E₁ : ι → Type wE₁}
(G : Type wG)
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[Π (i : ι), normed_add_comm_group (E₁ i)]
[Π (i : ι), normed_space 𝕜 (E₁ i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : Π (i : ι), E i ≃L[𝕜] E₁ i) :
continuous_multilinear_map 𝕜 E₁ G ≃L[𝕜] continuous_multilinear_map 𝕜 E G
continuous_multilinear_map.comp_continuous_linear_map as a bundled continuous linear equiv,
given f : Π i, E i ≃L[𝕜] E₁ i.
Equations
- continuous_multilinear_map.comp_continuous_linear_map_equivL G f = {to_linear_equiv := {to_fun := (continuous_multilinear_map.comp_continuous_linear_mapL (λ (i : ι), ↑(f i))).to_linear_map.to_fun, map_add' := _, map_smul' := _, inv_fun := ⇑(continuous_multilinear_map.comp_continuous_linear_mapL (λ (i : ι), ↑((f i).symm))), left_inv := _, right_inv := _}, continuous_to_fun := _, continuous_inv_fun := _}
@[simp]
theorem
continuous_multilinear_map.comp_continuous_linear_map_equivL_symm
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{E₁ : ι → Type wE₁}
(G : Type wG)
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[Π (i : ι), normed_add_comm_group (E₁ i)]
[Π (i : ι), normed_space 𝕜 (E₁ i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : Π (i : ι), E i ≃L[𝕜] E₁ i) :
@[simp]
theorem
continuous_multilinear_map.comp_continuous_linear_map_equivL_apply
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{E₁ : ι → Type wE₁}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[Π (i : ι), normed_add_comm_group (E₁ i)]
[Π (i : ι), normed_space 𝕜 (E₁ i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(g : continuous_multilinear_map 𝕜 E₁ G)
(f : Π (i : ι), E i ≃L[𝕜] E₁ i) :
⇑(continuous_multilinear_map.comp_continuous_linear_map_equivL G f) g = g.comp_continuous_linear_map (λ (i : ι), ↑(f i))
@[protected, instance]
def
continuous_multilinear_map.has_continuous_const_smul
{𝕜 : Type u}
{ι : Type v}
{E : ι → Type wE}
{G : Type wG}
[fintype ι]
[nontrivially_normed_field 𝕜]
[Π (i : ι), normed_add_comm_group (E i)]
[Π (i : ι), normed_space 𝕜 (E i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
{R : Type u_1}
[semiring R]
[module R G]
[smul_comm_class 𝕜 R G]
[has_continuous_const_smul R G] :
Currying #
We associate to a continuous multilinear map in n+1 variables (i.e., based on fin n.succ) two
curried functions, named f.curry_left (which is a continuous linear map on E 0 taking values
in continuous multilinear maps in n variables) and f.curry_right (which is a continuous
multilinear map in n variables taking values in continuous linear maps on E (last n)).
The inverse operations are called uncurry_left and uncurry_right.
We also register continuous linear equiv versions of these correspondences, in
continuous_multilinear_curry_left_equiv and continuous_multilinear_curry_right_equiv.
theorem
continuous_linear_map.norm_map_tail_le
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : Ei 0 →L[𝕜] continuous_multilinear_map 𝕜 (λ (i : fin n), Ei i.succ) G)
(m : Π (i : fin n.succ), Ei i) :
theorem
continuous_multilinear_map.norm_map_init_le
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 (λ (i : fin n), Ei (⇑fin.cast_succ i)) (Ei (fin.last n) →L[𝕜] G))
(m : Π (i : fin n.succ), Ei i) :
theorem
continuous_multilinear_map.norm_map_cons_le
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 Ei G)
(x : Ei 0)
(m : Π (i : fin n), Ei i.succ) :
theorem
continuous_multilinear_map.norm_map_snoc_le
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 Ei G)
(m : Π (i : fin n), Ei (⇑fin.cast_succ i))
(x : Ei (fin.last n)) :
Left currying #
noncomputable
def
continuous_linear_map.uncurry_left
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : Ei 0 →L[𝕜] continuous_multilinear_map 𝕜 (λ (i : fin n), Ei i.succ) G) :
continuous_multilinear_map 𝕜 Ei G
Given a continuous linear map f from E 0 to continuous multilinear maps on n variables,
construct the corresponding continuous multilinear map on n+1 variables obtained by concatenating
the variables, given by m ↦ f (m 0) (tail m)
@[simp]
theorem
continuous_linear_map.uncurry_left_apply
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : Ei 0 →L[𝕜] continuous_multilinear_map 𝕜 (λ (i : fin n), Ei i.succ) G)
(m : Π (i : fin n.succ), Ei i) :
noncomputable
def
continuous_multilinear_map.curry_left
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 Ei G) :
Ei 0 →L[𝕜] continuous_multilinear_map 𝕜 (λ (i : fin n), Ei i.succ) G
Given a continuous multilinear map f in n+1 variables, split the first variable to obtain
a continuous linear map into continuous multilinear maps in n variables, given by
x ↦ (m ↦ f (cons x m)).
Equations
- f.curry_left = {to_fun := λ (x : Ei 0), (⇑(f.to_multilinear_map.curry_left) x).mk_continuous (‖f‖ * ‖x‖) _, map_add' := _, map_smul' := _}.mk_continuous ‖f‖ _
@[simp]
theorem
continuous_multilinear_map.curry_left_apply
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 Ei G)
(x : Ei 0)
(m : Π (i : fin n), Ei i.succ) :
@[simp]
theorem
continuous_linear_map.curry_uncurry_left
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : Ei 0 →L[𝕜] continuous_multilinear_map 𝕜 (λ (i : fin n), Ei i.succ) G) :
f.uncurry_left.curry_left = f
@[simp]
theorem
continuous_multilinear_map.uncurry_curry_left
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 Ei G) :
f.curry_left.uncurry_left = f
noncomputable
def
continuous_multilinear_curry_left_equiv
(𝕜 : Type u)
{n : ℕ}
(Ei : fin n.succ → Type wEi)
(G : Type wG)
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G] :
(Ei 0 →L[𝕜] continuous_multilinear_map 𝕜 (λ (i : fin n), Ei i.succ) G) ≃ₗᵢ[𝕜] continuous_multilinear_map 𝕜 Ei G
The space of continuous multilinear maps on Π(i : fin (n+1)), E i is canonically isomorphic to
the space of continuous linear maps from E 0 to the space of continuous multilinear maps on
Π(i : fin n), E i.succ, by separating the first variable. We register this isomorphism in
continuous_multilinear_curry_left_equiv 𝕜 E E₂. The algebraic version (without topology) is given
in multilinear_curry_left_equiv 𝕜 E E₂.
The direct and inverse maps are given by f.uncurry_left and f.curry_left. Use these
unless you need the full framework of linear isometric equivs.
Equations
- continuous_multilinear_curry_left_equiv 𝕜 Ei G = linear_isometry_equiv.of_bounds {to_fun := continuous_linear_map.uncurry_left _inst_13, map_add' := _, map_smul' := _, inv_fun := continuous_multilinear_map.curry_left _inst_13, left_inv := _, right_inv := _} _ _
@[simp]
theorem
continuous_multilinear_curry_left_equiv_apply
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : Ei 0 →L[𝕜] continuous_multilinear_map 𝕜 (λ (i : fin n), Ei i.succ) G)
(v : Π (i : fin n.succ), Ei i) :
@[simp]
theorem
continuous_multilinear_curry_left_equiv_symm_apply
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 Ei G)
(x : Ei 0)
(v : Π (i : fin n), Ei i.succ) :
@[simp]
theorem
continuous_multilinear_map.curry_left_norm
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 Ei G) :
@[simp]
theorem
continuous_linear_map.uncurry_left_norm
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : Ei 0 →L[𝕜] continuous_multilinear_map 𝕜 (λ (i : fin n), Ei i.succ) G) :
Right currying #
noncomputable
def
continuous_multilinear_map.uncurry_right
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 (λ (i : fin n), Ei (⇑fin.cast_succ i)) (Ei (fin.last n) →L[𝕜] G)) :
continuous_multilinear_map 𝕜 Ei G
Given a continuous linear map f from continuous multilinear maps on n variables to
continuous linear maps on E 0, construct the corresponding continuous multilinear map on n+1
variables obtained by concatenating the variables, given by m ↦ f (init m) (m (last n)).
Equations
- f.uncurry_right = let f' : multilinear_map 𝕜 (λ (i : fin n), Ei (⇑fin.cast_succ i)) (Ei (fin.last n) →ₗ[𝕜] G) := {to_fun := λ (m : Π (i : fin n), Ei (⇑fin.cast_succ i)), (⇑f m).to_linear_map, map_add' := _, map_smul' := _} in f'.uncurry_right.mk_continuous ‖f‖ _
@[simp]
theorem
continuous_multilinear_map.uncurry_right_apply
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 (λ (i : fin n), Ei (⇑fin.cast_succ i)) (Ei (fin.last n) →L[𝕜] G))
(m : Π (i : fin n.succ), Ei i) :
noncomputable
def
continuous_multilinear_map.curry_right
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 Ei G) :
continuous_multilinear_map 𝕜 (λ (i : fin n), Ei (⇑fin.cast_succ i)) (Ei (fin.last n) →L[𝕜] G)
Given a continuous multilinear map f in n+1 variables, split the last variable to obtain
a continuous multilinear map in n variables into continuous linear maps, given by
m ↦ (x ↦ f (snoc m x)).
Equations
- f.curry_right = let f' : multilinear_map 𝕜 (λ (i : fin n), Ei (⇑fin.cast_succ i)) (Ei (fin.last n) →L[𝕜] G) := {to_fun := λ (m : Π (i : fin n), Ei (⇑fin.cast_succ i)), (⇑(f.to_multilinear_map.curry_right) m).mk_continuous (‖f‖ * finset.univ.prod (λ (i : fin n), ‖m i‖)) _, map_add' := _, map_smul' := _} in f'.mk_continuous ‖f‖ _
@[simp]
theorem
continuous_multilinear_map.curry_right_apply
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 Ei G)
(m : Π (i : fin n), Ei (⇑fin.cast_succ i))
(x : Ei (fin.last n)) :
@[simp]
theorem
continuous_multilinear_map.curry_uncurry_right
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 (λ (i : fin n), Ei (⇑fin.cast_succ i)) (Ei (fin.last n) →L[𝕜] G)) :
@[simp]
theorem
continuous_multilinear_map.uncurry_curry_right
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 Ei G) :
noncomputable
def
continuous_multilinear_curry_right_equiv
(𝕜 : Type u)
{n : ℕ}
(Ei : fin n.succ → Type wEi)
(G : Type wG)
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G] :
continuous_multilinear_map 𝕜 (λ (i : fin n), Ei (⇑fin.cast_succ i)) (Ei (fin.last n) →L[𝕜] G) ≃ₗᵢ[𝕜] continuous_multilinear_map 𝕜 Ei G
The space of continuous multilinear maps on Π(i : fin (n+1)), Ei i is canonically isomorphic to
the space of continuous multilinear maps on Π(i : fin n), Ei i.cast_succ with values in the space
of continuous linear maps on Ei (last n), by separating the last variable. We register this
isomorphism as a continuous linear equiv in continuous_multilinear_curry_right_equiv 𝕜 Ei G.
The algebraic version (without topology) is given in multilinear_curry_right_equiv 𝕜 Ei G.
The direct and inverse maps are given by f.uncurry_right and f.curry_right. Use these
unless you need the full framework of linear isometric equivs.
Equations
- continuous_multilinear_curry_right_equiv 𝕜 Ei G = linear_isometry_equiv.of_bounds {to_fun := continuous_multilinear_map.uncurry_right _inst_13, map_add' := _, map_smul' := _, inv_fun := continuous_multilinear_map.curry_right _inst_13, left_inv := _, right_inv := _} _ _
noncomputable
def
continuous_multilinear_curry_right_equiv'
(𝕜 : Type u)
(n : ℕ)
(G : Type wG)
(G' : Type wG')
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G'] :
continuous_multilinear_map 𝕜 (λ (i : fin n), G) (G →L[𝕜] G') ≃ₗᵢ[𝕜] continuous_multilinear_map 𝕜 (λ (i : fin n.succ), G) G'
The space of continuous multilinear maps on Π(i : fin (n+1)), G is canonically isomorphic to
the space of continuous multilinear maps on Π(i : fin n), G with values in the space
of continuous linear maps on G, by separating the last variable. We register this
isomorphism as a continuous linear equiv in continuous_multilinear_curry_right_equiv' 𝕜 n G G'.
For a version allowing dependent types, see continuous_multilinear_curry_right_equiv. When there
are no dependent types, use the primed version as it helps Lean a lot for unification.
The direct and inverse maps are given by f.uncurry_right and f.curry_right. Use these
unless you need the full framework of linear isometric equivs.
Equations
- continuous_multilinear_curry_right_equiv' 𝕜 n G G' = continuous_multilinear_curry_right_equiv 𝕜 (λ (i : fin n.succ), G) G'
@[simp]
theorem
continuous_multilinear_curry_right_equiv_apply
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 (λ (i : fin n), Ei (⇑fin.cast_succ i)) (Ei (fin.last n) →L[𝕜] G))
(v : Π (i : fin n.succ), Ei i) :
@[simp]
theorem
continuous_multilinear_curry_right_equiv_symm_apply
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 Ei G)
(v : Π (i : fin n), Ei (⇑fin.cast_succ i))
(x : Ei (fin.last n)) :
@[simp]
theorem
continuous_multilinear_curry_right_equiv_apply'
{𝕜 : Type u}
{n : ℕ}
{G : Type wG}
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(f : continuous_multilinear_map 𝕜 (λ (i : fin n), G) (G →L[𝕜] G'))
(v : fin (n + 1) → G) :
@[simp]
theorem
continuous_multilinear_curry_right_equiv_symm_apply'
{𝕜 : Type u}
{n : ℕ}
{G : Type wG}
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(f : continuous_multilinear_map 𝕜 (λ (i : fin n.succ), G) G')
(v : fin n → G)
(x : G) :
@[simp]
theorem
continuous_multilinear_map.curry_right_norm
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 Ei G) :
@[simp]
theorem
continuous_multilinear_map.uncurry_right_norm
{𝕜 : Type u}
{n : ℕ}
{Ei : fin n.succ → Type wEi}
{G : Type wG}
[nontrivially_normed_field 𝕜]
[Π (i : fin n.succ), normed_add_comm_group (Ei i)]
[Π (i : fin n.succ), normed_space 𝕜 (Ei i)]
[normed_add_comm_group G]
[normed_space 𝕜 G]
(f : continuous_multilinear_map 𝕜 (λ (i : fin n), Ei (⇑fin.cast_succ i)) (Ei (fin.last n) →L[𝕜] G)) :
Currying with 0 variables #
The space of multilinear maps with 0 variables is trivial: such a multilinear map is just an
arbitrary constant (note that multilinear maps in 0 variables need not map 0 to 0!).
Therefore, the space of continuous multilinear maps on (fin 0) → G with values in E₂ is
isomorphic (and even isometric) to E₂. As this is the zeroth step in the construction of iterated
derivatives, we register this isomorphism.
def
continuous_multilinear_map.uncurry0
{𝕜 : Type u}
{G : Type wG}
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(f : continuous_multilinear_map 𝕜 (λ (i : fin 0), G) G') :
G'
Associating to a continuous multilinear map in 0 variables the unique value it takes.
def
continuous_multilinear_map.curry0
(𝕜 : Type u)
(G : Type wG)
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(x : G') :
continuous_multilinear_map 𝕜 (λ (i : fin 0), G) G'
Associating to an element x of a vector space E₂ the continuous multilinear map in 0
variables taking the (unique) value x
Equations
- continuous_multilinear_map.curry0 𝕜 G x = continuous_multilinear_map.const_of_is_empty 𝕜 (λ (i : fin 0), G) x
@[simp]
theorem
continuous_multilinear_map.curry0_apply
(𝕜 : Type u)
{G : Type wG}
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(x : G')
(m : fin 0 → G) :
⇑(continuous_multilinear_map.curry0 𝕜 G x) m = x
@[simp]
theorem
continuous_multilinear_map.uncurry0_apply
{𝕜 : Type u}
{G : Type wG}
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(f : continuous_multilinear_map 𝕜 (λ (i : fin 0), G) G') :
@[simp]
theorem
continuous_multilinear_map.apply_zero_curry0
{𝕜 : Type u}
{G : Type wG}
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(f : continuous_multilinear_map 𝕜 (λ (i : fin 0), G) G')
{x : fin 0 → G} :
continuous_multilinear_map.curry0 𝕜 G (⇑f x) = f
theorem
continuous_multilinear_map.uncurry0_curry0
{𝕜 : Type u}
{G : Type wG}
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(f : continuous_multilinear_map 𝕜 (λ (i : fin 0), G) G') :
@[simp]
theorem
continuous_multilinear_map.curry0_uncurry0
(𝕜 : Type u)
(G : Type wG)
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(x : G') :
(continuous_multilinear_map.curry0 𝕜 G x).uncurry0 = x
@[simp]
theorem
continuous_multilinear_map.curry0_norm
(𝕜 : Type u)
(G : Type wG)
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(x : G') :
@[simp]
theorem
continuous_multilinear_map.fin0_apply_norm
{𝕜 : Type u}
{G : Type wG}
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(f : continuous_multilinear_map 𝕜 (λ (i : fin 0), G) G')
{x : fin 0 → G} :
theorem
continuous_multilinear_map.uncurry0_norm
{𝕜 : Type u}
{G : Type wG}
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(f : continuous_multilinear_map 𝕜 (λ (i : fin 0), G) G') :
def
continuous_multilinear_curry_fin0
(𝕜 : Type u)
(G : Type wG)
(G' : Type wG')
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G'] :
continuous_multilinear_map 𝕜 (λ (i : fin 0), G) G' ≃ₗᵢ[𝕜] G'
The continuous linear isomorphism between elements of a normed space, and continuous multilinear
maps in 0 variables with values in this normed space.
The direct and inverse maps are uncurry0 and curry0. Use these unless you need the full
framework of linear isometric equivs.
Equations
- continuous_multilinear_curry_fin0 𝕜 G G' = {to_linear_equiv := {to_fun := λ (f : continuous_multilinear_map 𝕜 (λ (i : fin 0), G) G'), f.uncurry0, map_add' := _, map_smul' := _, inv_fun := λ (f : G'), continuous_multilinear_map.curry0 𝕜 G f, left_inv := _, right_inv := _}, norm_map' := _}
@[simp]
theorem
continuous_multilinear_curry_fin0_apply
{𝕜 : Type u}
{G : Type wG}
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(f : continuous_multilinear_map 𝕜 (λ (i : fin 0), G) G') :
⇑(continuous_multilinear_curry_fin0 𝕜 G G') f = ⇑f 0
@[simp]
theorem
continuous_multilinear_curry_fin0_symm_apply
{𝕜 : Type u}
{G : Type wG}
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(x : G')
(v : fin 0 → G) :
⇑(⇑((continuous_multilinear_curry_fin0 𝕜 G G').symm) x) v = x
With 1 variable #
noncomputable
def
continuous_multilinear_curry_fin1
(𝕜 : Type u)
(G : Type wG)
(G' : Type wG')
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G'] :
Continuous multilinear maps from G^1 to G' are isomorphic with continuous linear maps from
G to G'.
Equations
- continuous_multilinear_curry_fin1 𝕜 G G' = (continuous_multilinear_curry_right_equiv 𝕜 (λ (i : fin 1), G) G').symm.trans (continuous_multilinear_curry_fin0 𝕜 G (G →L[𝕜] G'))
@[simp]
theorem
continuous_multilinear_curry_fin1_apply
{𝕜 : Type u}
{G : Type wG}
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(f : continuous_multilinear_map 𝕜 (λ (i : fin 1), G) G')
(x : G) :
@[simp]
theorem
continuous_multilinear_curry_fin1_symm_apply
{𝕜 : Type u}
{G : Type wG}
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(f : G →L[𝕜] G')
(v : fin 1 → G) :
@[simp]
theorem
continuous_multilinear_map.norm_dom_dom_congr
(𝕜 : Type u)
{ι : Type v}
{ι' : Type v'}
(G : Type wG)
(G' : Type wG')
[fintype ι]
[fintype ι']
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(σ : ι ≃ ι')
(f : continuous_multilinear_map 𝕜 (λ (_x : ι), G) G') :
def
continuous_multilinear_map.dom_dom_congrₗᵢ
(𝕜 : Type u)
{ι : Type v}
{ι' : Type v'}
(G : Type wG)
(G' : Type wG')
[fintype ι]
[fintype ι']
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(σ : ι ≃ ι') :
continuous_multilinear_map 𝕜 (λ (_x : ι), G) G' ≃ₗᵢ[𝕜] continuous_multilinear_map 𝕜 (λ (_x : ι'), G) G'
An equivalence of the index set defines a linear isometric equivalence between the spaces of multilinear maps.
Equations
- continuous_multilinear_map.dom_dom_congrₗᵢ 𝕜 G G' σ = {to_linear_equiv := {to_fun := (continuous_multilinear_map.dom_dom_congr_equiv σ).to_fun, map_add' := _, map_smul' := _, inv_fun := (continuous_multilinear_map.dom_dom_congr_equiv σ).inv_fun, left_inv := _, right_inv := _}, norm_map' := _}
noncomputable
def
continuous_multilinear_map.curry_sum
{𝕜 : Type u}
{ι : Type v}
{ι' : Type v'}
{G : Type wG}
{G' : Type wG'}
[fintype ι]
[fintype ι']
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(f : continuous_multilinear_map 𝕜 (λ (x : ι ⊕ ι'), G) G') :
continuous_multilinear_map 𝕜 (λ (x : ι), G) (continuous_multilinear_map 𝕜 (λ (x : ι'), G) G')
A continuous multilinear map with variables indexed by ι ⊕ ι' defines a continuous multilinear
map with variables indexed by ι taking values in the space of continuous multilinear maps with
variables indexed by ι'.
Equations
@[simp]
theorem
continuous_multilinear_map.curry_sum_apply
{𝕜 : Type u}
{ι : Type v}
{ι' : Type v'}
{G : Type wG}
{G' : Type wG'}
[fintype ι]
[fintype ι']
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(f : continuous_multilinear_map 𝕜 (λ (x : ι ⊕ ι'), G) G')
(m : ι → G)
(m' : ι' → G) :
noncomputable
def
continuous_multilinear_map.uncurry_sum
{𝕜 : Type u}
{ι : Type v}
{ι' : Type v'}
{G : Type wG}
{G' : Type wG'}
[fintype ι]
[fintype ι']
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(f : continuous_multilinear_map 𝕜 (λ (x : ι), G) (continuous_multilinear_map 𝕜 (λ (x : ι'), G) G')) :
continuous_multilinear_map 𝕜 (λ (x : ι ⊕ ι'), G) G'
A continuous multilinear map with variables indexed by ι taking values in the space of
continuous multilinear maps with variables indexed by ι' defines a continuous multilinear map with
variables indexed by ι ⊕ ι'.
@[simp]
theorem
continuous_multilinear_map.uncurry_sum_apply
{𝕜 : Type u}
{ι : Type v}
{ι' : Type v'}
{G : Type wG}
{G' : Type wG'}
[fintype ι]
[fintype ι']
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
(f : continuous_multilinear_map 𝕜 (λ (x : ι), G) (continuous_multilinear_map 𝕜 (λ (x : ι'), G) G'))
(m : ι ⊕ ι' → G) :
noncomputable
def
continuous_multilinear_map.curry_sum_equiv
(𝕜 : Type u)
(ι : Type v)
(ι' : Type v')
(G : Type wG)
(G' : Type wG')
[fintype ι]
[fintype ι']
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G'] :
continuous_multilinear_map 𝕜 (λ (x : ι ⊕ ι'), G) G' ≃ₗᵢ[𝕜] continuous_multilinear_map 𝕜 (λ (x : ι), G) (continuous_multilinear_map 𝕜 (λ (x : ι'), G) G')
Linear isometric equivalence between the space of continuous multilinear maps with variables
indexed by ι ⊕ ι' and the space of continuous multilinear maps with variables indexed by ι
taking values in the space of continuous multilinear maps with variables indexed by ι'.
The forward and inverse functions are continuous_multilinear_map.curry_sum
and continuous_multilinear_map.uncurry_sum. Use this definition only if you need
some properties of linear_isometry_equiv.
Equations
- continuous_multilinear_map.curry_sum_equiv 𝕜 ι ι' G G' = linear_isometry_equiv.of_bounds {to_fun := continuous_multilinear_map.curry_sum _inst_15, map_add' := _, map_smul' := _, inv_fun := continuous_multilinear_map.uncurry_sum _inst_15, left_inv := _, right_inv := _} _ _
noncomputable
def
continuous_multilinear_map.curry_fin_finset
(𝕜 : Type u)
(G : Type wG)
(G' : Type wG')
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
{k l n : ℕ}
{s : finset (fin n)}
(hk : s.card = k)
(hl : sᶜ.card = l) :
continuous_multilinear_map 𝕜 (λ (i : fin n), G) G' ≃ₗᵢ[𝕜] continuous_multilinear_map 𝕜 (λ (i : fin k), G) (continuous_multilinear_map 𝕜 (λ (i : fin l), G) G')
If s : finset (fin n) is a finite set of cardinality k and its complement has cardinality
l, then the space of continuous multilinear maps G [×n]→L[𝕜] G' of n variables is isomorphic
to the space of continuous multilinear maps G [×k]→L[𝕜] G [×l]→L[𝕜] G' of k variables taking
values in the space of continuous multilinear maps of l variables.
Equations
- continuous_multilinear_map.curry_fin_finset 𝕜 G G' hk hl = (continuous_multilinear_map.dom_dom_congrₗᵢ 𝕜 G G' (fin_sum_equiv_of_finset hk hl).symm).trans (continuous_multilinear_map.curry_sum_equiv 𝕜 (fin k) (fin l) G G')
@[simp]
theorem
continuous_multilinear_map.curry_fin_finset_apply
{𝕜 : Type u}
{n : ℕ}
{G : Type wG}
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
{k l : ℕ}
{s : finset (fin n)}
(hk : s.card = k)
(hl : sᶜ.card = l)
(f : continuous_multilinear_map 𝕜 (λ (i : fin n), G) G')
(mk : fin k → G)
(ml : fin l → G) :
@[simp]
theorem
continuous_multilinear_map.curry_fin_finset_symm_apply
{𝕜 : Type u}
{n : ℕ}
{G : Type wG}
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
{k l : ℕ}
{s : finset (fin n)}
(hk : s.card = k)
(hl : sᶜ.card = l)
(f : continuous_multilinear_map 𝕜 (λ (i : fin k), G) (continuous_multilinear_map 𝕜 (λ (i : fin l), G) G'))
(m : fin n → G) :
⇑(⇑((continuous_multilinear_map.curry_fin_finset 𝕜 G G' hk hl).symm) f) m = ⇑(⇑f (λ (i : fin k), m (⇑(fin_sum_equiv_of_finset hk hl) (sum.inl i)))) (λ (i : fin l), m (⇑(fin_sum_equiv_of_finset hk hl) (sum.inr i)))
@[simp]
theorem
continuous_multilinear_map.curry_fin_finset_symm_apply_piecewise_const
{𝕜 : Type u}
{n : ℕ}
{G : Type wG}
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
{k l : ℕ}
{s : finset (fin n)}
(hk : s.card = k)
(hl : sᶜ.card = l)
(f : continuous_multilinear_map 𝕜 (λ (i : fin k), G) (continuous_multilinear_map 𝕜 (λ (i : fin l), G) G'))
(x y : G) :
@[simp]
theorem
continuous_multilinear_map.curry_fin_finset_symm_apply_const
{𝕜 : Type u}
{n : ℕ}
{G : Type wG}
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
{k l : ℕ}
{s : finset (fin n)}
(hk : s.card = k)
(hl : sᶜ.card = l)
(f : continuous_multilinear_map 𝕜 (λ (i : fin k), G) (continuous_multilinear_map 𝕜 (λ (i : fin l), G) G'))
(x : G) :
@[simp]
theorem
continuous_multilinear_map.curry_fin_finset_apply_const
{𝕜 : Type u}
{n : ℕ}
{G : Type wG}
{G' : Type wG'}
[nontrivially_normed_field 𝕜]
[normed_add_comm_group G]
[normed_space 𝕜 G]
[normed_add_comm_group G']
[normed_space 𝕜 G']
{k l : ℕ}
{s : finset (fin n)}
(hk : s.card = k)
(hl : sᶜ.card = l)
(f : continuous_multilinear_map 𝕜 (λ (i : fin n), G) G')
(x y : G) :