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This paper has been withdrawn by the authors

This paper has been withdrawn due to a crucial error in the proof of the main theorem

This paper has been withdrawn by the author.

This paper has been withdrawn because the content has been substantially improved in a later paper, arXiv:0806.1165.

This paper has been withdrawn by the author(s), due to the existence of a much better paper in http://arxiv.org/abs/cs.CR/0207027

A modified version of this paper is under process and with a new title and abstract. Hence, this version of the article is completely withdrawn.

The paper was retracted.

After receiving useful peer comments, we would like to withdraw this paper.

The paper has been withdrawn by the author, due to a critical error stemming from the defined template.

This paper has been withdrawn by the authors due to an unlikely results.

This paper was withdrawn by the author due to an edition's rights

This paper has been withdrawn.

This paper has been withdrawn.

This paper has been withdrawn. Its main conclusions have been published in "On dynamics of integrate-and-fi re neural networks with conductance based synapses", arXiv:0709.4370 and…

This paper has been withdrawn

This paper has been withdrawn by the author, due to the insecurity against attacks received in quant-ph/0605027v5.

The paper has been withdrawn.

This paper has been withdrawn by the author due to that the main results and approaches are closedly parallel to the ones in Lie algebra case.

There is a technical issue in the analysis that is not easily fixable. We, therefore, withdraw the submission. Sorry for the inconvenience.

This paper has been withdrawn by the author due to similarity to the author's other paper