changeset 19934 | 8190655ea2d4 |
parent 19770 | be5c23ebe1eb |
child 20270 | 3abe7dae681e |
--- a/src/HOL/FunDef.thy Wed Jun 21 10:26:39 2006 +0200 +++ b/src/HOL/FunDef.thy Wed Jun 21 11:08:04 2006 +0200 @@ -86,4 +86,10 @@ let_cong if_cong image_cong INT_cong UN_cong bex_cong ball_cong imp_cong +lemma split_cong[fundef_cong]: + "\<lbrakk> \<And>x y. (x, y) = q \<Longrightarrow> f x y = g x y; p = q \<rbrakk> + \<Longrightarrow> split f p = split g q" + by (auto simp:split_def) + + end