src/Pure/subgoal.ML
2013-12-31 wenzelm proper context for norm_hhf and derived operations;
2013-05-29 wenzelm tuned signature -- more explicit flags for low-level Thm.bicompose;
2012-10-13 wenzelm tuned signature;
2011-04-27 wenzelm clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
2011-04-16 wenzelm modernized structure Proof_Context;
2009-12-11 wenzelm Subgoal.FOCUS etc.: resulting goal state is normalized as usual for resolution;
2009-08-05 wenzelm SUBPROOF: recovered Goal.check_finished;
2009-07-30 wenzelm retrofit: more precise handling of locally introduced schematic variables (avoid zero_var_indexes);
2009-07-30 wenzelm qualified Subgoal.FOCUS;
2009-07-30 wenzelm focus: more precise treatment of schematic variables, only the "visible" part of the text is fixed;
2009-07-26 wenzelm added focus_params/FOCUS_PARAMS, which focus on the parameter prefix only;
2009-07-26 wenzelm retrofit: actually handle schematic variables -- need to export into original context;
2009-07-26 wenzelm advanced retrofit, which allows new subgoals and variables;
2009-06-24 wenzelm renamed Variable.import_thms to Variable.import (back again cf. ed7aa5a350ef -- Alice is no longer supported);
2009-03-16 wenzelm provide Simplifier.norm_hhf(_protect) as regular simplifier operation;
2009-01-21 wenzelm removed Ids;
2007-04-03 wenzelm renamed Variable.import to import_thms (avoid clash with Alice keywords);
2006-11-30 wenzelm qualified MetaSimplifier.norm_hhf(_protect);
2006-09-18 wenzelm Thm.dest_arg;
2006-08-02 wenzelm Variable.focus_subgoal;
2006-07-27 wenzelm tuned interfaces;
2006-07-26 wenzelm focus: result record includes (fixed) schematic variables;
2006-07-25 wenzelm Tactical operations depending on local subgoal structure.
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