proposition: Lemma expr_div_n x y n : (x / y) ^+ n = x ^+ n / y ^+ n.
proof: Proof. by rewrite exprMn exprVn. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq) mathcomp(choice fintype finfun bigop prime binomial)