src/HOL/Library/Boolean_Algebra.thy
Wed, 17 Jun 2015 11:03:05 +0200 wenzelm isabelle update_cartouches;
Sun, 02 Nov 2014 17:20:45 +0100 wenzelm modernized header;
Fri, 27 Dec 2013 14:35:14 +0100 haftmann prefer target-style syntaxx for sublocale
Thu, 28 Jan 2010 11:48:43 +0100 haftmann dropped mk_left_commute; use interpretation of locale abel_semigroup instead
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