Related papers: Free algebras and the Freiheitssatz

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This paper is withdrawn by the author. See math.GT/9811093 for replacement.

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This paper has been withdrawn by the authors. Because of a misunderstanding, the paper was submitted prematurely to the arXiv. A replacement will follow.

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This paper has been withdrawn because it is a duplicate of [math/0609208].

This paper is withdrawn. The revised paper appears in chao-dyn/9904020

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This paper has been withdrawn due to a gap in the proof of the main result.

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This paper has been withdrawn due to a crucial error in the proof of the main theorem

This paper has been withdrawn by the author. The paper has been accepted for publication in Communications on Pure and Applied Mathematics.

This paper was withdrawn as it may have appeared elsewhere, although in a different form.