changeset 1035 | 279a4fd3c5ce |
parent 839 | 1aa6b351ca34 |
child 1056 | 097b3255bf3a |
--- a/src/ZF/equalities.ML Thu Apr 13 11:35:24 1995 +0200 +++ b/src/ZF/equalities.ML Thu Apr 13 11:37:39 1995 +0200 @@ -67,6 +67,10 @@ by (fast_tac (eq_cs addSEs [equalityE]) 1); qed "subset_Int_iff2"; +goal ZF.thy "!!A B C. C<=A ==> (A-B) Int C = C-B"; +by (fast_tac eq_cs 1); +qed "Int_Diff_eq"; + (** Binary Union **) goal ZF.thy "0 Un A = A";