∫ Утверждение Mathlib
mem_of_formPerm_apply_ne
Mathlib.GroupTheory.Perm.List
URI: https://scilib.ai/kg/mathlib#List.mem_of_formPerm_apply_ne
∫ Утверждение Mathlib
Mathlib.GroupTheory.Perm.List
URI: https://scilib.ai/kg/mathlib#List.mem_of_formPerm_apply_ne