Mon, 31 Jan 2000 16:18:42 +0100 paulson new theorem rev_ImageI
Mon, 31 Jan 2000 16:18:09 +0100 paulson various theorems about image and inverse image
Mon, 31 Jan 2000 16:13:28 +0100 paulson Pi_empty1 is a more general simprule than empty_fun
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