Tue, 18 Oct 2016 17:41:56 +0200 wenzelm replaced inefficient valid_accesses by is_valid_access, based on stored input accesses: e.g. relevant for Proof_Context.update_thms;
Tue, 18 Oct 2016 16:11:13 +0200 wenzelm tuned signature, in accordance to Isabelle_System;
Tue, 18 Oct 2016 16:08:55 +0200 wenzelm tuned;
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