Tue, 15 Jan 2013 20:26:38 -0800 huffman generalize more topology lemmas
Tue, 15 Jan 2013 19:28:48 -0800 huffman generalize topology lemmas; simplify proofs
Thu, 17 Jan 2013 15:50:56 +0100 wenzelm merged
Thu, 17 Jan 2013 15:49:50 +0100 wenzelm tuned signature (again) -- keep Properties more generic;
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