proposition: Lemma conjC0 : 0^* = 0 :> C.
proof: Proof. exact: rmorph0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)