Sun, 29 May 2016 14:43:17 +0200 haftmann do not export abstract constructors in code_reflect
Sun, 29 May 2016 14:10:48 +0200 nipkow added subtheory of longest common prefix
Fri, 27 May 2016 23:58:24 +0200 wenzelm tuned proofs;
Fri, 27 May 2016 23:35:13 +0200 wenzelm tuned proofs;
Fri, 27 May 2016 20:23:55 +0200 wenzelm tuned proofs, to allow unfold_abs_def;
Fri, 27 May 2016 20:13:06 +0200 wenzelm clarified "unfold" operations;
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