proposition: Lemma cst_nnfun_subproof (x : {nonneg R}) : @isNonNegFun T R (cst x%:num).
proof: Proof. by split=> /=. Qed.
imports: HB(structures) mathcomp(all_ssreflect ssralg ssrnum ssrint interval finmap) mathcomp(mathcomp_extra boolp classical_sets functions) mathcomp(cardinality fsbigop ) signed reals ereal topology normedtype sequences real_interval esum measure lebesgue_measure numfun