fact: Definition has_magnitude {n m : nat} (mat : Matrix R m n) : UU := (weighting mat) × (coweighting mat).
imports: UniMath.Foundations.PartA UniMath.MoreFoundations.PartA UniMath.Combinatorics.FiniteSequences UniMath.Algebra.BinaryOperations UniMath.Algebra.IteratedBinaryOperations UniMath.Algebra.RigsAndRings