src/HOL/Library/Discrete.thy
Tue, 13 Aug 2013 16:25:47 +0200 wenzelm standardized symbols via "isabelle update_sub_sup", excluding src/Pure and src/Tools/WWW_Find;
Sun, 24 Feb 2013 20:29:13 +0100 haftmann turned example into library for comparing growth of functions
Sun, 17 Feb 2013 22:56:54 +0100 haftmann fundamentals about discrete logarithm and square root
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