proposition: Lemma pmulrnI n : (0 < n)%N -> injective ((@GRing.natmul R)^~ n).
proof: Proof. by move/ler_pMn2r/inc_inj. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)