proposition: Lemma leif_mean_square_scaled x y : x * y *+ 2 <= x ^+ 2 + y ^+ 2 ?= iff (x == y).
proof: Proof. exact: real_leif_mean_square_scaled. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)