∫ Утверждение Mathlib
mem_center_iff
Mathlib.GroupTheory.Subsemigroup.Center
URI: https://scilib.ai/kg/mathlib#Subsemigroup.mem_center_iff
∫ Утверждение Mathlib
Mathlib.GroupTheory.Subsemigroup.Center
URI: https://scilib.ai/kg/mathlib#Subsemigroup.mem_center_iff