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Perfect Morse functions and exotic S^2 x S^2's (1005.4674v2)
Published 25 May 2010 in math.GT
Abstract: The main theorem of the paper shows that a smooth manifold which is homeomorphic to S2xS2 and has nonvanishing Ozsvath-Szabo invariant does not admit a perfect Morse function. I am withdrawing the paper because it is unclear to me if such a manifold exists.
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