Thu, 02 Feb 2006 19:57:13 +0100 reimplemented using Equiv_Relations.thy
huffman [Thu, 02 Feb 2006 19:57:13 +0100] rev 18913
reimplemented using Equiv_Relations.thy
Thu, 02 Feb 2006 18:04:10 +0100 improvement in devarifications
haftmann [Thu, 02 Feb 2006 18:04:10 +0100] rev 18912
improvement in devarifications
Thu, 02 Feb 2006 18:03:35 +0100 alternative syntax for instances
haftmann [Thu, 02 Feb 2006 18:03:35 +0100] rev 18911
alternative syntax for instances
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