Thu, 16 Apr 2015 14:18:32 +0200 wenzelm explicit error for Toplevel.proof_of;
Thu, 16 Apr 2015 13:48:10 +0200 wenzelm clarified thy_deps;
Thu, 16 Apr 2015 13:39:21 +0200 wenzelm tuned;
Thu, 16 Apr 2015 12:37:30 +0200 wenzelm tuned signature;
Thu, 16 Apr 2015 12:03:43 +0200 wenzelm misc tuning and clarification;
Thu, 16 Apr 2015 11:22:36 +0200 wenzelm let the system choose Graph_Display.display_graph_old: thm_deps needs tree hierarchy, code_deps needs cycles (!?);
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