proposition: Lemma zify_mulrz_subproof e1 n : rval e1 *~ n = (zval e1 *~ n)%:~R.
proof: Proof. by rewrite zifyRingE -mulrzA -mulrzz. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(fintype finfun bigop order ssralg ssrnum ssrint)