Related papers: Free algebras and the Freiheitssatz

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The paper has been withdrawn by the author due to a gap in Proof of Theorem 1.1.

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This paper has been withdrawn by the author, due an error in the proof of Proposion 2.13.

The paper has been withdrawn due to a crucial error in section 3.

This paper has been withdrawn by the author(s) in the light of several other works available and due to a misunderstanding in the authorships.

This paper has been withdrawn by the author due to a gap in the proof of the main result.

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This paper has been withdrawn due to non-clearness of some technical points, as well as lack of a reasonable statement of quantization conjecture.

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This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.