Wed, 28 Jun 2000 10:42:14 +0200 paulson tidied a monstrous proof
Wed, 28 Jun 2000 10:41:16 +0200 paulson deleted a redundant bind_thm
Wed, 28 Jun 2000 10:40:06 +0200 paulson using the new theorem wf_not_refl; tidied
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