proposition: Lemma coef_comp_poly p q n : (p \Po q)`_n = \sum_(i < size p) p`_i * (q ^+ i)`_n.
proof: Proof. exact: coef_comp_poly. 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)