proposition: Lemma measurable_set1Ny : G.-sigma.-measurable [set -oo].
proof: Proof. rewrite eset1Ny; apply: bigcapT_measurable=> i; rewrite -setCitvr. by apply: measurableC; apply: sub_sigma_algebra; exists (- i%:R)%R. Qed.
imports: mathcomp(all_ssreflect ssralg ssrnum ssrint interval) mathcomp(finmap fingroup perm rat) mathcomp(mathcomp_extra boolp classical_sets functions) mathcomp(cardinality fsbigop) reals ereal signed topology numfun normedtype HB(structures) sequences esum measure real_interval realfun exp lebesgue_stieltjes_measure