∫ Утверждение Mathlib
instDecidablePredMulOppositeIsSquare
Mathlib.Algebra.Group.Even
URI: https://scilib.ai/kg/mathlib#instDecidablePredMulOppositeIsSquare
∫ Утверждение Mathlib
Mathlib.Algebra.Group.Even
URI: https://scilib.ai/kg/mathlib#instDecidablePredMulOppositeIsSquare