proposition: Lemma my_size_exp p n : p != 0 -> (size (p ^+ n)) = ((size p).-1 * n).+1%N.
proof: Proof. by move=> hp; rewrite -size_exp prednK // size_poly_gt0 expf_neq0. Qed.
imports: mathcomp.ssreflect.ssreflect mathcomp(ssrfun ssrbool eqtype ssrnat seq choice fintype) mathcomp(bigop order ssralg poly polydiv ssrnum zmodp) mathcomp(polyorder path interval ssrint)