Sat, 20 Aug 2011 15:19:35 -0700 huffman replace lemma realpow_two_diff with new lemma square_diff_square_factored
Sat, 20 Aug 2011 15:54:26 -0700 huffman remove redundant lemma real_0_le_divide_iff in favor or zero_le_divide_iff
Sat, 20 Aug 2011 13:07:00 -0700 huffman move lemma add_eq_0_iff to Groups.thy
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