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Withdrawn due to error. See D. Lowe, L. Susskind and J. Uglum, hep-th/9402136, for correct treatment. Apologies to all recipients.

This paper has been withdrawn by the authors due to an error in Section 7.

This paper has been withdrawn by the author due to an erro thereon line -2 of page 4.

This paper has been withdrawn by the author due to the fact that the results were found to be done previously.

This paper has been withdrawn by the authors because it has been merged with paper arXiv:0903.3501v1 [math.DG]

This article has been withdrawn due to an error in a proof of the main result.

This paper has been withdrawn by Chien-Yu, Chen due to the authors fields error.

The paper was withdrawn by the author. Further research is needed.

This paper has been retracted, for obvious reasons.

They are possible other cases at first done not contemplate. This paper has been withdrawn by the author due to a crucial sign error in equation 1 page 4

The paper is withdrawn due to an error in Section 2.

This paper has been withdrawn because the content has been substantially improved in a later paper, arXiv:0806.1165.

This paper has been withdrawn by the author because has been send to other journal.

This paper has been withdrawn by the author because the conclusions reached in it are incorrect.

This paper has been withdrawn by the author. Proofs of two propositions need more details.

This paper has been withdrawn due to a crucial error in the proof of the main theorem

This paper has been withdrawn due to a critical error discovered in Theorem 4.21. Anyone with a historical or pragamatic interest in prior "negative results", however - e.g., failed proof attempts relating to the (in)consistency of ZF or…

This paper has been withdrawn by the author due to an error in the data-analysis.

This paper has been withdrawn by the author due to the presented idea is wrong.

This paper has been withdrawn by the authors due to an error.