proposition: Lemma TsetT : T`* setT = setT :> {set A * B}.
proof: Proof. by apply/setP => -[a b]; rewrite !inE. 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