proposition: Lemma sq_RV_ge0 X x : 0 <= sq_RV X x.
proof: Proof. by rewrite sq_RV_pow2; exact: pow2_ge_0. Qed.
imports: mathcomp(all_ssreflect ssralg ssrnum matrix) mathcomp(Rstruct reals) Reals Lra ssrR Reals_ext realType_ext logb ssr_ext ssralg_ext bigop_ext fdist