proposition: Lemma dEFin_snum_subproof nz cond (x : {num R & nz & cond}) : Signed.spec 0 nz cond (dEFin x%:num).
proof: Proof. exact: EFin_snum_subproof. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap) mathcomp(mathcomp_extra) signed