src/HOL/Isar_examples/Summation.thy
Sat, 30 Oct 1999 20:20:48 +0200 wenzelm improved presentation;
Thu, 28 Oct 1999 19:57:34 +0200 wenzelm improved presentation;
Thu, 14 Oct 1999 16:02:39 +0200 wenzelm improved presentation;
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