2005-06-17 haftmann 2005-06-17 migrated theory headers to new format
2004-06-16 paulson 2004-06-16 removal of x-symbol syntax <Sigma> for dependent products
2003-08-28 skalberg 2003-08-28 Extended the notion of letter and digit, such that now one may use greek, gothic, euler, or calligraphic letters as normal letters.
2003-07-25 nipkow 2003-07-25 Replaced \<leadsto> by \<rightharpoonup>
2003-03-17 nipkow 2003-03-17 just a few mods to a few thms
2001-11-22 wenzelm 2001-11-22 renamed "fields" to "flds" (avoid clash with new "fields" operation);
2001-09-28 wenzelm 2001-09-28 recdef (permissive);
2001-09-21 oheimb 2001-09-21 Minor improvements, added Example
2001-09-10 oheimb 2001-09-10 simplified vnam/vname, introduced fname, improved comments
2001-06-16 oheimb 2001-06-16 added NanoJava