proposition: Lemma divp_addl_mul d q r : d != 0 -> (q * d + r) %/ d = q + r %/ d.
proof: Proof. by move=> dn0; rewrite divpD mulpK. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop ssralg poly)