Fri, 30 Jun 2000 12:30:58 +0200 wenzelm fixed ISABELLE_BROWSER_INFO;
Fri, 30 Jun 2000 10:59:50 +0200 paulson removed the mutual recursion from "bin_add"
Fri, 30 Jun 2000 10:58:03 +0200 paulson tidied and deleted two redundant theories
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