1996-01-11 ago Removed bug in type unification. Negative indexes are not used any longer.
1995-12-22 ago Now "standard" compresses theorems (for sharing).
1995-09-01 ago added same_sg and same_thm
1995-09-01 ago adapted to new version of shyps-stuff;
1995-08-01 ago modified pretty_thm, standard, eq_thm to handle shyps;
1995-07-25 ago Added weak_eq_thm and forall_intr_vars (thanks to Mark Staples)
1995-03-14 ago Removed an old bug which made some simultaneous instantiations fail if they
1995-03-13 ago Changed treatment of during type inference internally generated type
1995-03-03 ago added CPure (curried functions) and ProtoPure (ancestor of Pure and CPure)
1995-01-11 ago removed print_sign, print_axioms;
1994-12-09 ago improved axioms_of: returns thms as the manual says;
1994-11-14 ago Pure/drule/cprems_of, cskip_flexpairs, cstrip_imp_prems: new cterm operations
1994-10-31 ago Pure/drule/thin_rl: new
1994-10-25 ago minor change of occs_const in dest_defn;
1994-10-12 ago add_defs: improved error messages;
1994-08-23 ago added print_syntax: theory -> unit;
1994-08-19 ago added add_defs, add_defs_i;
1994-05-26 ago replaced ext_axtab by new_axioms;
1994-05-19 ago added print_sign, print_axioms: theory -> unit;
1994-02-03 ago removed eq_sg, pprint_sg, print_sg (now in sign.ML);
1994-01-18 ago Pure: MAJOR CHANGE. Moved ML types ctyp and cterm and their associated
1994-01-05 ago added new parameter to the simplification tactics which indicates if
1994-01-04 ago added fake_cterm_of to speed up rewriting
1994-01-04 ago commented out sig constraint of functor (for debugging purposes);
1993-12-21 ago pretty_thm is now exported;
1993-10-21 ago Pure/drule/print_goals_ref: new, for Centaur interface
1993-09-24 ago Added MRS, MRL from ZF/ROOT.ML. These support forward proof, resolving a
1993-09-16 ago Initial revision