proposition: Lemma nonincreasing_is_cvgn (u_ : R ^nat) : nonincreasing_seq u_ -> has_lbound (range u_) -> cvgn u_.
proof: Proof. by move=> u_decr u_bnd; apply: cvgP; exact: nonincreasing_cvgn. Qed.
imports: mathcomp(all_ssreflect ssralg ssrint ssrnum matrix) mathcomp(interval rat) mathcomp(mathcomp_extra boolp classical_sets functions) mathcomp(set_interval) reals ereal signed topology normedtype landau