proposition: Lemma norm_eq0 a : norm a = 0%N -> a = 0.
proof: Proof. exact: (Dvd.norm_eq0 norm_mul edivP). 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