proposition: Lemma poweR_eqy x r : x `^ r = +oo -> x = +oo.
proof: Proof. by case: x => [x| |] //=; case: ifP. 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