fact: Definition abmonoidrer (X : abmonoid) (a b c d : X) : paths (op (op a b) (op c d)) (op (op a c) (op b d)) := abmonoidoprer (pr2 X) a b c d.
imports: UniMath.Algebra.BinaryOperations UniMath.MoreFoundations.Subtypes UniMath.MoreFoundations.Sets UniMath.MoreFoundations.Orders