Related papers: Amenability and co-amenability in non-abelian grou…

Paper withdrawn because of a gap in the proof of Proposition 3 of Thomas Schick: "Integrality of L2-Betti numbers", Math.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 Most results of the withdrawn paper were based on this proposition.

This paper has been withdrawn by the author, due to errors in the figures.

The paper has been withdrawn because the proof of part (b) of the main theorem is incomplete.

This paper has been withdrawn by arXiv administrators because of disputed claims of authorship among former collaborators

This paper has been withdrawn

This paper has been withdrawn by the authors due to a gap in the proof of the main result (in 5.3).

This paper has been withdrawn by the author due to a crucial error in the submission action.

This paper has been withdrawn due to a crucial theoretical error.

This paper has been withdrawn by the author for further investigation.

This article is withdrawn because of a mistake in the main result of the paper.

This paper has been withdrawn by the author, due to an error in the proof of lemma 7.4. However, numerical evidence strongly suggest that this lemma is true.

This paper has been withdrawn by the author; see the much expanded, improved, and generalized version at arXiv:0811.2080.

This paper has been withdrawn by the authors due to a crucial gap in the estimates for m>=4.

The paper has been withdrawn

This paper has been withdrawn to address an omission. It will be resubmitted in the near future.

This paper has been withdraw by the auhor due to a mistake in classification of the algebra

This paper has been withdrawn by the author, due to errors in the figures.

This paper was withdrawn by the authors.

This paper has been withdrawn because it is a duplicate of [math/0609208].

This paper has been withdrawn by the authors because M. Aschenbrenner pointed out that the proof of theorem 3.1 was incorrect.