Results on finitely supported functions. #

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The tensor product of ι →₀ M and κ →₀ N is linearly equivalent to (ι × κ) →₀ (M ⊗ N).

noncomputable def finsupp_tensor_finsupp (R : Type u_1) (M : Type u_2) (N : Type u_3) (ι : Type u_4) (κ : Type u_5) [comm_ring R] [add_comm_group M] [module R M] [add_comm_group N] [module R N] :

The tensor product of ι →₀ M and κ →₀ N is linearly equivalent to (ι × κ) →₀ (M ⊗ N).

Equations

@[simp]

theorem finsupp_tensor_finsupp_single (R : Type u_1) (M : Type u_2) (N : Type u_3) (ι : Type u_4) (κ : Type u_5) [comm_ring R] [add_comm_group M] [module R M] [add_comm_group N] [module R N] (i : ι) (m : M) (k : κ) (n : N) :

@[simp]

theorem finsupp_tensor_finsupp_apply (R : Type u_1) (M : Type u_2) (N : Type u_3) (ι : Type u_4) (κ : Type u_5) [comm_ring R] [add_comm_group M] [module R M] [add_comm_group N] [module R N] (f : ι →₀ M) (g : κ →₀ N) (i : ι) (k : κ) :

@[simp]

theorem finsupp_tensor_finsupp_symm_single (R : Type u_1) (M : Type u_2) (N : Type u_3) (ι : Type u_4) (κ : Type u_5) [comm_ring R] [add_comm_group M] [module R M] [add_comm_group N] [module R N] (i : ι × κ) (m : M) (n : N) :

noncomputable def finsupp_tensor_finsupp' (S : Type u_1) [comm_ring S] (α : Type u_2) (β : Type u_3) :

A variant of finsupp_tensor_finsupp where both modules are the ground ring.

Equations

@[simp]

theorem finsupp_tensor_finsupp'_apply_apply (S : Type u_1) [comm_ring S] (α : Type u_2) (β : Type u_3) (f : α →₀ S) (g : β →₀ S) (a : α) (b : β) :

@[simp]

theorem finsupp_tensor_finsupp'_single_tmul_single (S : Type u_1) [comm_ring S] (α : Type u_2) (β : Type u_3) (a : α) (b : β) (r₁ r₂ : S) :