proposition: Lemma mdomP m i : mdom_spec m i (i \in finsupp m) (m i).
proof: Proof. by case: finsuppP=> h; constructor. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path choice finset fintype finfun) mathcomp(tuple bigop ssralg ssrint ssrnum) xfinmap