相关论文: Free algebras and the Freiheitssatz

This paper has been withdrawn by the author.

The paper has been withdrawn by the author due to a gap in Proof of Theorem 1.1.

The paper was withdrawn by the author. Further research is needed.

This paper has been withdrawn

This paper has been withdrawn.

This paper has been withdrawn.

This paper has been withdrawn by the author, due an error in the proof of Proposion 2.13.

The paper has been withdrawn due to a crucial error in section 3.

This paper has been withdrawn by the author(s) in the light of several other works available and due to a misunderstanding in the authorships.

This paper has been withdrawn by the author due to a gap in the proof of the main result.

This paper has been withdrawn

This paper has been withdrawn by the author for further investigation.

This paper has been withdrawn by the author(s), due the final version in math.QA/0604564

This paper has been withdrawn due to an error, and no further revisions will be made.

This paper has been withdrawn

The paper has been withdrawn by the author.

This paper has been withdrawn by the author.

This paper has been withdrawn due to non-clearness of some technical points, as well as lack of a reasonable statement of quantization conjecture.

The paper has been withdrawn

This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.