Thu, 08 Jan 2009 21:13:40 -0800 huffman merged.
Thu, 08 Jan 2009 12:25:22 -0800 huffman remove type-specific proofs
Thu, 08 Jan 2009 10:43:09 -0800 huffman add lemma dvd_diff to class comm_ring_1
Thu, 08 Jan 2009 10:26:50 -0800 huffman add lemmas dvd_minus_iff and minus_dvd_iff in class comm_ring_1
Thu, 08 Jan 2009 10:07:39 -0800 huffman move lemmas mult_minus{left,right} inside class ring
Thu, 08 Jan 2009 09:58:36 -0800 huffman clean up division_ring proofs
Thu, 08 Jan 2009 09:12:29 -0800 huffman add class ring_div; generalize mod/diff/minus proofs for class ring_div
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