Sat, 14 Apr 2007 17:38:30 +0200 wenzelm tuned comment;
Sat, 14 Apr 2007 17:36:19 +0200 wenzelm cleaned/simplified Sign.read_typ, Thm.read_cterm etc.;
Sat, 14 Apr 2007 17:36:18 +0200 wenzelm removed redundant string_of_vname (see term.ML);
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