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Equiv
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Imports
Init
Mathlib.GroupTheory.Perm.Basic
Imported by
Equiv
.
symm_trans
source
@[simp]
theorem
Equiv
.
symm_trans
{α :
Type
u_1}
{β :
Type
u_2}
{γ :
Type
u_3}
(f :
α
≃
β
)
(g :
β
≃
γ
)
:
(
f
.trans
g
)
.symm
=
g
.symm
.trans
f
.symm