proposition: Lemma cvg_addnl N : addn N @ \oo --> \oo.
proof: Proof. by move=> P [n _ Pn]; exists (n - N)%N => // m; rewrite /= leq_subLR => /Pn. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap generic_quotient) mathcomp(boolp classical_sets functions) mathcomp(cardinality mathcomp_extra fsbigop) reals signed