proposition: Lemma expR_eq0 x : (expR x == 0) = false.
proof: Proof. by rewrite gt_eqF ?expR_gt0. Qed.
imports: mathcomp(all_ssreflect ssralg ssrint ssrnum matrix) mathcomp(interval rat) mathcomp(boolp classical_sets functions) mathcomp(mathcomp_extra) reals ereal signed topology normedtype landau sequences derive realfun itv convex