proposition: Lemma partdom_union_intpartl (s t1 t2 : intpart) : partdom t1 t2 -> partdom (union_intpart s t1) (union_intpart s t2).
proof: Proof. exact: partdomsh_merge. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(div ssralg ssrint ssrnum binomial) tools combclass sorted ordtype