proposition: Lemma near T (F : set_system T) P (FP : F P) (x : T) (Px : prop_of (InFilter FP) x) : P x.
proof: Proof. by move: Px; rewrite prop_ofE. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap generic_quotient) mathcomp(boolp classical_sets functions) mathcomp(cardinality mathcomp_extra fsbigop) reals signed