proposition: Lemma monalgOver_addr_closed : addr_closed (monalgOver S).
proof: Proof. split=> [|g1 g2 Sg1 Sg2]; rewrite ?monalgOver0 //. by apply/monalgOverP=> m; rewrite mcoeffD rpredD ?(monalgOverP _). Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path choice finset fintype finfun) mathcomp(tuple bigop ssralg ssrint ssrnum) xfinmap