Sun, 24 Jan 2016 20:37:40 +0100 wenzelm proper nesting: 'qed' needs to close the corresponding 'proof' and goal statement;
Sun, 24 Jan 2016 15:30:32 +0100 wenzelm clarified exception handling;
Sun, 24 Jan 2016 15:25:39 +0100 wenzelm guard sessions that no longer work with SML/NJ -- memory problems;
Sun, 24 Jan 2016 15:02:56 +0100 wenzelm tuned signature;
Sun, 24 Jan 2016 15:02:29 +0100 wenzelm tuned;
Sun, 24 Jan 2016 14:58:56 +0100 wenzelm tuned;
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