Related papers: Optimal time evolution in (non)hermitian quantum m…

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This paper has been withdrawn by the author.

This paper has been withdrawn by the author.

This paper has been withdrawn.

This paper has been withdrawn by the author due to new results to be added.

This paper has been withdrawn by the authors, since the reference citation were not appropriately arranged.

This paper has been withdrawn by the author because overcame by arXiv:0910.4694

This paper has been withdrawn by the author.

The paper has been withdrawn

Major mistake. The paper has been withdrawn.

This paper has been withdrawn by the authors.

This paper has been withdrawn by the author

This paper has been withdrawn by the author: it was a too preliminary version.

The paper has been withdrawn by the author due to a gap in Proof of Theorem 1.1.

This paper has been withdrawn.

This paper has been withdrawn by the author due to a crucial error.

This paper has been withdrawn by the authors due to an unlikely results.

This paper has been withdrawn. See published paper http://arxiv.org/math.HO/0512390

This paper has been withdrawn. A much-improved version can be found at hep-ph/0209176.