proposition: Lemma conjC_eq0 x : (x^* == 0) = (x == 0).
proof: Proof. exact: fmorph_eq0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)