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trivial changes

new reference to HO patterns

Pure/tctical/protect_subgoal: simplified to use Sequence.hd
Pure/tctical/DEPTH_FIRST: now suppresses duplicate solutions

Pure/term: commented typ_subst_TVars, subst_TVars, subst_Vars, subst_vars

Mon, 21 Nov 1994 18:48:03 +0100
ZF INDUCTIVE DEFINITIONS: Simplifying the type checking for mutually

ZF INDUCTIVE DEFINITIONS: Simplifying the type checking for mutually
recursive datatypes, especially with monotone operators
ZF/add_ind_def/add_fp_def: deleted as obsolete
ZF/add_ind_def/add_fp_def_i: now takes dom_sum instead of domts. We no
longer automatically construct a sum of separate domains, but could use a
sum-closed set such as univ(A).

ZF/intr_elim/elim: now "folds" definitions of the mutually recursive sets!

replaced 'val ... = result();' by 'qed "...";'

ZF/indrule/mutual_ind_tac: backtracks using DEPTH_SOLVE to be certain of
solving the subgoal. Entire tactic is enclosed in DETERM to prevent
backtracking between subgoals.

ZF/EquivClass/congruent_commuteI: uncommented and simplified proof

ZF/ZF.ML/UN_iff, INT_iff: added to the signature