Sun, 31 Jan 2010 14:51:30 +0100 haftmann more correspondence lemmas between related operations; tuned some proofs
Thu, 28 Jan 2010 11:48:49 +0100 haftmann new theory Algebras.thy for generic algebraic structures
Thu, 28 Jan 2010 11:48:43 +0100 haftmann dropped mk_left_commute; use interpretation of locale abel_semigroup instead
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