Mon, 03 Jun 1996 11:44:44 +0200 Shortened some proofs
paulson [Mon, 03 Jun 1996 11:44:44 +0200] rev 1785
Shortened some proofs
Mon, 03 Jun 1996 11:43:55 +0200 Added a new theorem, UN_Int_subset
paulson [Mon, 03 Jun 1996 11:43:55 +0200] rev 1784
Added a new theorem, UN_Int_subset
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