∫ Утверждение Mathlib
unop_mem_center_iff
Mathlib.GroupTheory.Submonoid.Center
URI: https://scilib.ai/kg/mathlib#MulOpposite.unop_mem_center_iff
∫ Утверждение Mathlib
Mathlib.GroupTheory.Submonoid.Center
URI: https://scilib.ai/kg/mathlib#MulOpposite.unop_mem_center_iff