proposition: Fact exprzD_nat x (m n : nat) : x ^ (m%:Z + n) = x ^ m * x ^ n.
proof: Proof. exact: exprD. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(fintype finfun bigop order ssralg countalg ssrnum) mathcomp(poly)