proposition: Lemma weak_ent_filter : Filter weak_ent.
proof: Proof. apply: filter_from_filter; first by exists setT; exact: entourageT. by move=> P Q ??; (exists (P `&` Q); first exact: filterI) => ?. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap generic_quotient) mathcomp(boolp classical_sets functions) mathcomp(cardinality mathcomp_extra fsbigop) reals signed