Related papers: Single vortex in a 2D optical lattices

This paper has been withdrawn due to a crucial error in the proof of the main theorem

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This paper has been withdrawn by the author, due an error in the proof of Proposion 2.13.

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This paper has been withdrawn by the author due to a missing figure

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This paper has been withdrawn by the author due to a crucial sign error in equation 1.

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This paper is withdrawn by the author. See math.GT/9811093 for replacement.

The paper has been withdrawn due to numerical error.