proposition: Lemma fgledd D : D <=g D.
proof: Proof. by apply/fgleP=> z; rewrite lexx. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop order generic_quotient) mathcomp(ssralg ssrnum ssrint)