2011-09-03 haftmann assert Pure equations for theorem references; avoid dynamic reference to fact
2011-09-03 haftmann assert Pure equations for theorem references; tuned
2011-09-03 haftmann tuned specifications and proofs
2011-09-03 wenzelm merged
2011-09-03 huffman remove duplicate lemma finite_choice in favor of finite_set_choice
2011-09-03 huffman simplify proof
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