fact: Definition entrywise_unit (un : X) (unax : isunit op un) : isunit (entrywise n m op) (const_matrix un).
imports: UniMath.Foundations.PartA UniMath.MoreFoundations.PartA UniMath.Combinatorics.FiniteSequences UniMath.Algebra.BinaryOperations UniMath.Algebra.IteratedBinaryOperations UniMath.Algebra.RigsAndRings