Related papers: Ulam's Conjecture is True for Connected Graphs

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The paper has been withdrawn.

This paper has been withdrawn by the authors. We have discovered an error in the evaluation of the diagram, which invalidates our conclusion.

This paper has been withdrawn by the author due to the result being known

This paper has been withdrawn by the author: it was a too preliminary version.

This paper has been withdrawn: it has been merged with the preprint to which it refers.

This paper has been withdrawn by the author, due to the fact that the main result in it has already been obtained in [1] for any c < e, see also [2] and [3]. Moreover the formula which gives the minimal vertex-cover in a tree (see the…

Paper withdrawn because of a gap in the proof of Proposition 3 of Thomas Schick: "Integrality of L2-Betti numbers", Math. Ann. 317, 727-750 (arXiv.org/abs/math.gt/0001101). Most results of the withdrawn paper were based on this proposition.

This paper has been withdrawn, and will be superseded by another submission.

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This paper has been withdrawn by the author.

This paper has been withdrawn by arXiv administrators because of disputed claims of authorship among former collaborators

This paper has been withdrawn by the author due to a error in attachment of source file.

This paper has been withdrawn by the author because Proposition 1 is not valid.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to a critical error in the proof of Theorem A pointed out by Burkhard Wilking.

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This paper has been withdrawn by the author due to similarity to Author's other paper

This paper has been withdrawn by the author due to errors.

This paper has been withdrawn by the author due to a crucial error.