doc-src/IsarImplementation/implementation.tex
2008-05-09 wenzelm added local copy of underscore.sty;
2008-05-08 wenzelm improved treatment of "_" thanks to underscore.sty;
2007-05-08 wenzelm tuned;
2006-09-12 wenzelm more on terms;
2006-09-07 wenzelm tuned;
2006-09-04 wenzelm tuned;
2006-09-04 wenzelm tuned;
2006-08-31 wenzelm misc cleanup;
2006-07-08 wenzelm tuned;
2006-07-06 wenzelm tuned;
2006-03-04 wenzelm tuned;
2006-01-03 wenzelm more stuff;
2006-01-02 wenzelm "The Isabelle/Isar Implementation" manual;
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