Related papers: On homology classes not representable by products

This paper has been withdrawn by the author, as it is now incorporated in 0901.4506 (v4)

This paper was withdrawn by the authors.

The paper is withdrawn.

This paper has been withdrawn because it is a duplicate of [math/0609208].

This paper has been withdrawn. A much-improved version can be found at hep-ph/0209176.

This paper has been withdrawn by the authors.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This paper has been withdrawn by the authors; its contents are superseded by that of hep-th/0105305 and hep-th/0212275.

This paper has been withdrawn due to the adherance to the double submission policies of a refereed journal. Our apologies.

This submission has been withdrawn by arXiv administrators due to misrepresentation of authorship.

This paper has been withdrawn by the corresponding author because the newest version is now published in Journal of Discrete Algorithms.

This paper has been withdrawn by the author due to a crucial sign error in Theorem 3.4.

This paper has been withdrawn.

This paper has been withdrawn

This paper has been withdrawn by the author because it is superseded by a new preprint: Tran Doan Huan & Nguyen Phuc Hai: arXiv:1010.5162.

This paper has been retracted.

This paper has been withdrawn by the author due to it contains some errors. A corrected treatment is presented in further publications of the author.

This paper has been withdrawn due to upload of another version of it as a new preprint: gr-qc/0404097

This submission has been withdrawn at the request of the author.

This paper has been withdrawn by the author(s), due an error in the proof.

This paper has been withdrawn by the author(s), due to the existence of a much better paper in http://arxiv.org/abs/cs.CR/0207027