Thu, 04 Sep 2008 17:24:18 +0200 huffman reorganize subsections
Thu, 04 Sep 2008 17:21:49 +0200 huffman rename INF_drop_prefix to INFM_drop_prefix
Thu, 04 Sep 2008 17:19:57 +0200 huffman add lemma power_Suc2; generalize power_minus from class comm_ring_1 to ring_1
Thu, 04 Sep 2008 17:18:44 +0200 huffman move diff_add_cancel, add_diff_cancel from class ab_group_add to group_add
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