proposition: Lemma Pr_to_cplt E : Pr E = 1 - Pr (~: E).
proof: Proof. by rewrite -(Pr_cplt E); field. 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