proposition: Lemma nearE {T} {F : set_system T} (P : set T) : (\forall x \near F, P x) = F P.
proof: Proof. by []. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap generic_quotient) mathcomp(boolp classical_sets functions) mathcomp(cardinality mathcomp_extra fsbigop) reals signed