Mon, 26 May 1997 12:40:51 +0200 paulson Deleted option_case_tac because exhaust_tac performs a similar function.
Mon, 26 May 1997 12:39:57 +0200 paulson Renamed lessD to Suc_leI
Mon, 26 May 1997 12:38:29 +0200 paulson New operator "lists" for formalizing sets of lists
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