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.
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.
ENat
.
BigOperators
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Imports
Init
Mathlib.Data.ENat.Lattice
Mathlib.Algebra.Order.BigOperators.Group.Finset
Imported by
ENat
.
sum_iSup
ENat
.
sum_iSup_of_monotone
Sum of suprema in
ENat
#
source
theorem
ENat
.
sum_iSup
{α :
Type
u_1}
{ι :
Type
u_2}
{s :
Finset
α
}
{f :
α
→
ι
→
ℕ∞
}
(hf :
∀ (
i
j
:
ι
),
∃ (
k
:
ι
),
∀ (
a
:
α
),
f
a
i
≤
f
a
k
∧
f
a
j
≤
f
a
k
)
:
∑
a
∈
s
,
⨆ (
i
:
ι
),
f
a
i
=
⨆ (
i
:
ι
),
∑
a
∈
s
,
f
a
i
source
theorem
ENat
.
sum_iSup_of_monotone
{α :
Type
u_1}
{ι :
Type
u_2}
[
Preorder
ι
]
[
IsDirected
ι
fun (
x1
x2
:
ι
) =>
x1
≤
x2
]
{s :
Finset
α
}
{f :
α
→
ι
→
ℕ∞
}
(hf :
∀ (
a
:
α
),
Monotone
(
f
a
)
)
:
∑
a
∈
s
,
iSup
(
f
a
)
=
⨆ (
n
:
ι
),
∑
a
∈
s
,
f
a
n