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This paper has been withdrawn by the authors until some changes are made.

This paper is being withdrawn because another paper by the author makes it obsolete. See comments for directions to new paper.

This paper has been withdrawn by the author due to the inaccurate result.

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We prove large-data local stability theorems for several spin models in two dimensions.

This paper has been withdrawn by the authors; its contents are superseded by that of hep-th/0105305 and hep-th/0212275.

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This paper has been withdrawn by the authors, since we have come to believe that the present approach is not convergent at small doping. We will shortly submit an improved theory of the tJJ' model at small J/t in the dilute hole limit. This…

This paper has been withdrawn by the authors because the paper is largely revised and improved, and to appear in Mechanics Research Communications.

This paper has been withdrawn by the authors due to inadequate formula Eq. (105) and following arguments.

This paper has been withdrawn.

This paper has been withdrawn by the authors.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This paper has been withdrawn by the author because overcame by arXiv:0910.4694

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This paper has been withdrawn by the author. Proofs of two propositions need more details.

This paper has been withdrawn by the author: it was a too preliminary version.

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This paper has been withdrawn by the author due to an error estimate in Lemma 3.1.