Fri, 13 Dec 2013 20:20:15 +0100 wenzelm maintain morphism names for diagnostic purposes;
Fri, 13 Dec 2013 14:58:47 +0100 wenzelm tuned -- prefer canonical argument order of fold_rev;
Fri, 13 Dec 2013 14:15:52 +0100 wenzelm proper simplifier context;
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