fact: Definition is_permutation_fun {n : nat} (p : ⟦ n ⟧%stn -> ⟦ n ⟧%stn) := ∏ i j: ⟦ n ⟧%stn, (p i = p j) -> i = j.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.Combinatorics.StandardFiniteSets UniMath.Combinatorics.Vectors UniMath.Algebra.RigsAndRings UniMath.Algebra.IteratedBinaryOperations UniMath.Algebra.Matrix UniMath.Algebra.Domains_and_Fields UniMath.Algebra.GaussianElimination.Auxiliary UniMath.Algebra.GaussianElimination.Vectors