1994-02-08 wenzelm 1994-02-08 improved eq_sg; cosmetical change in print_sg;
1994-02-03 wenzelm 1994-02-03 major cleanup; added eq_sig; added print_sg (full contents), pprint_sg (stamps only); added certify_typ, certify_term; changed read_typ: result now certified;
1994-01-18 lcp 1994-01-18 Pure: MAJOR CHANGE. Moved ML types ctyp and cterm and their associated functions from sign.ML to thm.ML or drule.ML. This allows the "prop" field of a theorem to be regarded as a cterm -- avoids expensive calls to cterm_of.
1994-01-11 nipkow 1994-01-11 moved misplaced comment
1994-01-04 nipkow 1994-01-04 added fake_cterm_of to speed up rewriting
1993-12-30 nipkow 1993-12-30 added subsig: sg * sg -> bool to test if one signature is contained in another.
1993-12-21 nipkow 1993-12-21 Necessary changes to accomodate type abbreviations.
1993-12-14 nipkow 1993-12-14 Updated read_insts to approximate simultaneous type checking of substitution pairs.
1993-11-30 wenzelm 1993-11-30 *** empty log message ***
1993-11-29 wenzelm 1993-11-29 extend: cleaned up, adapted for new Syntax.extend; extend, merge: improved roots (logical_types) handling;
1993-11-25 nipkow 1993-11-25 changed some names and deleted *NORMALIZED*
1993-11-25 wenzelm 1993-11-25 Sign.extend: Syntax.extend now called with read_ty;
1993-10-04 wenzelm 1993-10-04 Pure/ROOT.ML cleaned comments; removed extraneous 'print_depth 1'; replaced Basic_Syntax by BasicSyntax added 'use "install_pp.ML"'; Pure/README fixed comments; Pure/POLY.ML Pure/NJ.ML make_pp: added fbrk; Pure/install_pp.ML replaced "Ast" by "Syntax"; Pure/sign.ML added 'quote' to some error msgs;
1993-09-16 clasohm 1993-09-16 Initial revision