proposition: Lemma gcdr0 a : gcdr a 0 %= a.
proof: Proof. by rewrite /eqd dvdr_gcd dvdr0 dvdrr !andbT. Qed.
imports: HB(structures) Coq(ssreflect ssrfun ssrbool Arith.Wf_nat) mathcomp(eqtype ssrnat div seq path) mathcomp(ssralg fintype perm tuple choice generic_quotient) mathcomp(matrix bigop zmodp mxalgebra poly) stronglydiscrete