Thu, 12 Oct 2000 12:19:15 +0200 paulson new theorem and SD-rule zmod_eq_0_iff
Thu, 12 Oct 2000 12:18:51 +0200 paulson delrules [r_into_rtrancl] required because the new I-rule made a step slow.
Thu, 12 Oct 2000 12:16:58 +0200 paulson tidied
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