Mon, 10 May 2010 21:33:48 -0700 huffman minimize imports
Mon, 10 May 2010 21:27:52 -0700 huffman move lemma real_mult_is_one to Rings.thy, renamed to square_eq_1_iff
Wed, 12 May 2010 12:50:00 +0200 wenzelm clarified Pretty.font_metrics;
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