Mon, 05 Jan 2009 00:12:49 +0100 wenzelm simplified tty model -- back to plain list history, which is independent of editor model;
Mon, 05 Jan 2009 00:10:38 +0100 wenzelm added is_control, is_regular, is_theory_begin;
Sun, 04 Jan 2009 15:40:30 +0100 wenzelm more precise is_relevant: requires original main goal, not initial goal state;
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