proposition: Lemma iscontr_nil_col_matrix {X : UU} {m : nat} : iscontr (Matrix X m 0).
proof: Proof. apply impred_iscontr; intro; apply iscontr_nil_vector. Defined.
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