Sat, 26 Jan 2008 17:08:41 +0100 added theorem group property;
wenzelm [Sat, 26 Jan 2008 17:08:41 +0100] rev 25982
added theorem group property;
Sat, 26 Jan 2008 17:08:40 +0100 added theorem group operations;
wenzelm [Sat, 26 Jan 2008 17:08:40 +0100] rev 25981
added theorem group operations; note_thmss: add kind to *all* intermediate thms; get_kind: default to empty name;
Sat, 26 Jan 2008 17:08:39 +0100 added surround;
wenzelm [Sat, 26 Jan 2008 17:08:39 +0100] rev 25980
added surround;
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