changeset 15201 | d73f9d49d835 |
parent 14060 | c0c4af41fa3b |
child 16417 | 9bc16273c2d4 |
--- a/src/ZF/Arith.thy Mon Sep 13 09:57:25 2004 +0200 +++ b/src/ZF/Arith.thy Fri Sep 17 16:08:52 2004 +0200 @@ -307,6 +307,9 @@ lemma add_lt_elim1: "[| k#+m < k#+n; m \<in> nat; n \<in> nat |] ==> m < n" by (drule add_lt_elim1_natify, auto) +lemma zero_less_add: "[| n \<in> nat; m \<in> nat |] ==> 0 < m #+ n <-> (0<m | 0<n)" +by (induct_tac "n", auto) + subsection{*Monotonicity of Addition*}