proposition: Lemma diracT (a : T) : \d_a setT = 1 :> \bar R.
proof: Proof. by rewrite diracE in_setT. 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)