Related papers: Effective descent maps for schemes

This paper has been withdrawn by the author, due to errors in Groebner basis calculations in the cases of five and six dimensional groups.

This paper has been withdrawn by the authors because M. Aschenbrenner pointed out that the proof of theorem 3.1 was incorrect.

This paper has been withdrawn by the author due to a gap in the proof of the main result.

This paper has been withdrawn by the corresponding author because the newest version is now published in Discrete Applied Mathematics.

This paper has been withdrawn by the author due to a some errors in figures 2 and 3.

The paper has been withdrawn by the author, due to it being fundamentally flawed. The author apologizes for any inconvenience it may have caused.

This paper has been withdrawn by the author due to an error in the proof of Theorem 1.

This paper is wrong and is therefore withdrawn.

This paper has been withdrawn by the author due to a crucial errors.

This paper has been withdrawn by the author due to a serious mistake on Lemma 2.4.

This paper has been withdrawn by the author due to a crucial sign error in equation 1.

The methods used to prove the main result must be incorrect, as they can be used to arrive at a contradiction with previously known results. Thus the paper was withdrawn.

This paper has been withdrawn by the author due to rewritting and skipping crucial sign errors.

I withdraw my paper from arXiv because there is a technical error in the proof of Theorem 1.1. And because of this error, all the results in the paper are untrue. I am very sorry for this.

This paper is withdrawn.

This paper has been withdrawn by the author due to a crucial error in last part of proof.

This paper has been withdrawn due to an error in the proof of the main theorem.

This paper has been retracted.

This paper has been withdrawn by the author, due a crucial error in Eq. 6.

The paper has been withdrawn