Tue, 20 Jun 2000 11:51:21 +0200 paulson changed a step for the improved rules for setsum
Tue, 20 Jun 2000 11:50:33 +0200 paulson deleted a step made redundant by the improved rules for setsum
Tue, 20 Jun 2000 11:42:24 +0200 paulson replaced the useless [p]subset_insertD by [p]subset_insert_iff
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