proposition: Lemma trivIset_seqD F : nondecreasing_seq F -> trivIset setT (seqD F).
proof: Proof. by move=> ndF; rewrite -seqDU_seqD //; exact: trivIset_seqDU. 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