proposition: Lemma ae_eq_trans f g h : ae_eq f g -> ae_eq g h -> ae_eq f h.
proof: Proof. by apply: filterS2 => x + + Dx => /(_ Dx) ->; exact. Qed.
imports: mathcomp(all_ssreflect all_algebra finmap) mathcomp(mathcomp_extra boolp classical_sets functions) mathcomp(cardinality fsbigop ) reals ereal signed topology normedtype sequences esum numfun HB(structures)