Thu, 14 Dec 2000 19:37:43 +0100 wenzelm tuned;
Thu, 14 Dec 2000 19:37:27 +0100 wenzelm unsymbolize;
Thu, 14 Dec 2000 19:37:09 +0100 wenzelm use \<Sum> from main HOL;
Thu, 14 Dec 2000 19:36:48 +0100 wenzelm added Summation;
Thu, 14 Dec 2000 10:30:45 +0100 paulson many new proofs; still needs tidying
Thu, 14 Dec 2000 10:30:11 +0100 paulson new theorem real_lbound_gt_zero
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