Wed, 12 Jul 2006 21:19:27 +0200 wenzelm * Isar: ":" (colon) is no longer a symbolic identifier character;
Wed, 12 Jul 2006 21:19:24 +0200 wenzelm removed duplicate of Tactic.make_elim_preserve;
Wed, 12 Jul 2006 21:19:22 +0200 wenzelm removed obsolete adhoc_freeze_vars (may use Variable.import_terms instead);
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