proposition: Lemma fin_numElt x : (x \is a fin_num) = (-oo < x < +oo).
proof: Proof. by rewrite fin_numE -leye_eq -leeNy_eq -2!ltNge. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap) mathcomp(mathcomp_extra) signed