proposition: Lemma cvg_snd {T U F G} {FF : Filter F} : (@snd T U) @ filter_prod F G --> G.
proof: Proof. by move=> P; apply: filter_prod2. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap generic_quotient) mathcomp(boolp classical_sets functions) mathcomp(cardinality mathcomp_extra fsbigop) reals signed