src/HOL/Semiring_Normalization.thy
Fri, 01 Nov 2013 18:51:14 +0100 haftmann more simplification rules on unary and binary minus
Sun, 18 Aug 2013 18:49:45 +0200 wenzelm more symbols;
Sun, 23 Jun 2013 21:16:07 +0200 haftmann migration from code_(const|type|class|instance) to code_printing and from code_module to code_identifier
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