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Mathlib
.
GroupTheory
.
Abelianization
.
Finite
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Imports
Init
Mathlib.GroupTheory.Abelianization.Defs
Mathlib.GroupTheory.Coset.Card
Imported by
instFintypeAbelianizationOfDecidablePredMemSubgroupCommutator
instFiniteAbelianization
The abelianization of a finite group is finite
#
source
instance
instFintypeAbelianizationOfDecidablePredMemSubgroupCommutator
{
G
:
Type
u_1}
[
Group
G
]
[
Fintype
G
]
[
DecidablePred
fun (
x
:
G
) =>
x
∈
commutator
G
]
:
Fintype
(
Abelianization
G
)
Equations
instFintypeAbelianizationOfDecidablePredMemSubgroupCommutator
=
QuotientGroup.fintype
(
commutator
G
)
source
instance
instFiniteAbelianization
{
G
:
Type
u_1}
[
Group
G
]
[
Finite
G
]
:
Finite
(
Abelianization
G
)