proposition: Lemma ltr_wpXn2r n : (0 < n)%N -> {in nneg & , {homo (@GRing.exp R)^~ n : x y / x < y}}.
proof: Proof. by move=> ngt0 x y /= x0 y0 hxy; rewrite ltrXn2r // -lt0n. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)