Tue, 01 Jul 1997 10:34:30 +0200 paulson New laws for the "lists" operator
Mon, 30 Jun 1997 12:08:19 +0200 nipkow More concat lemmas.
Fri, 27 Jun 1997 10:47:13 +0200 paulson Corrected indentations and margins after the renaming of "set_of_list"
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