Fri, 24 Jan 1997 18:24:04 +0100 wenzelm *** empty log message ***
Fri, 24 Jan 1997 17:37:59 +0100 wenzelm Isabelle NEWS -- history of user-visible changes;
Fri, 24 Jan 1997 17:12:28 +0100 wenzelm changed case symbol to \<Rightarrow>;
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