proposition: Lemma contract_eq1 x : (contract x == 1%R) = (x == +oo).
proof: Proof. by rewrite -(can_eq contractK). Qed.
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap) mathcomp(mathcomp_extra boolp classical_sets functions) mathcomp(fsbigop cardinality set_interval) reals signed topology constructive_ereal