Related papers: Space-bounded computation: quantum is better than …

This paper is withdrawn. See quant-ph/9806031 for a discussion.

This paper has been withdrawn.

This paper has been withdrawn, because the result turned out to be well known.

This paper has been withdrawn by the authors due to the fact that the conjecture has indeed already long been established.

This paper has been withdrawn. See quant-ph/9806031 for a discussion.

The article is taken out.

This paper has been withdrawn.

The paper has been withdrawn

This paper is withdrawn.

This paper has been withdrawn because the content has been substantially improved in a later paper, arXiv:0806.1165.

This paper has been retracted, for obvious reasons.

This paper has been withdrawn.

This paper has been withdrawn

The paper was retracted.

This paper has been withdrawn, and will be superseded by another submission.

The paper has been withdrawn.

This paper has been withdrawn by the author due to the version of [A complete proof of Hamilton's conjecture] at arXiv:1008.1576

This paper has been withdrawn by the author due to a crucial error in eq.59. I apologize for the inconveniences.

This paper has been withdrawn.

This paper was withdrawn by the author. It turns out that similar ideas have been presented before. The author apologizes.