Wed, 26 Mar 2014 14:41:52 +0100 wenzelm prefer Context_Position where a context is available;
Wed, 26 Mar 2014 14:15:34 +0100 wenzelm unused;
Wed, 26 Mar 2014 12:32:51 +0100 wenzelm more uniform Execution.fork vs. Execution.print;
Wed, 26 Mar 2014 12:15:42 +0100 wenzelm added Execution.print: accumulate print operations for some command execution, which are applied later and print time;
Wed, 26 Mar 2014 11:05:25 -0700 huffman tuned proofs
Wed, 26 Mar 2014 14:00:37 +0000 paulson Some useful lemmas
Wed, 26 Mar 2014 09:19:04 +0100 wenzelm tuned comments;
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