Wed, 10 Jan 2001 11:08:29 +0100 nipkow *** empty log message ***
Wed, 10 Jan 2001 11:07:11 +0100 paulson now using "by" for one-line proofs
Wed, 10 Jan 2001 11:06:07 +0100 paulson introduction of "by" and a few examples of SOME
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