changeset 1784 | 036a7f301623 |
parent 1652 | 9b78ce58d6b1 |
child 2469 | b50b8c0eec01 |
--- a/src/ZF/equalities.ML Mon Jun 03 11:41:26 1996 +0200 +++ b/src/ZF/equalities.ML Mon Jun 03 11:43:55 1996 +0200 @@ -270,6 +270,10 @@ by (fast_tac eq_cs 1); qed "INT_Int_distrib"; +goal ZF.thy "(UN z:I Int J. A(z)) <= (UN z:I. A(z)) Int (UN z:J. A(z))"; +by (fast_tac ZF_cs 1); +qed "UN_Int_subset"; + (** Devlin, page 12, exercise 5: Complements **) goal ZF.thy "!!A B. i:I ==> B - (UN i:I. A(i)) = (INT i:I. B - A(i))";