proposition: Lemma mcoeffU1 k k' : (<< k >> : {malg R[K]})@_k' = (k == k')%:R.
proof: Proof. by rewrite mcoeffU. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path choice finset fintype finfun) mathcomp(tuple bigop ssralg ssrint ssrnum) xfinmap