Wed, 02 Jan 2008 01:20:18 +0100 huffman update instance proofs to new style
Tue, 01 Jan 2008 20:35:16 +0100 huffman declare sprodE as cases rule; new induction rule sprod_induct
Tue, 01 Jan 2008 20:30:16 +0100 huffman add induction rule ssum_induct
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