2011-02-19 urbanc first two proofs in 2 direction
2011-02-19 urbanc first proof
2011-02-19 urbanc updated second direction
2011-02-19 urbanc included comments by Chunhan
2011-02-18 urbanc added comment from Larry
2011-02-18 urbanc updated bib
2011-02-18 urbanc polished everything
2011-02-17 urbanc more on the conclusion
2011-02-17 urbanc first ideas about conclusion
2011-02-17 urbanc completed first direction
2011-02-16 urbanc minor updated
2011-02-16 urbanc filled details in one place
2011-02-15 urbanc updated paper
2011-02-15 urbanc updated paper
2011-02-15 urbanc updated paper
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