proposition: Lemma connected0 : connected (@set0 T).
proof: Proof. by move=> ? ? [? ?]; rewrite set0I. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap generic_quotient) mathcomp(boolp classical_sets functions) mathcomp(cardinality mathcomp_extra fsbigop) reals signed