相关论文: Configurations in abelian categories. II. Moduli s…

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This paper has been withdrawn by the authors. We have discovered an error in the evaluation of the diagram, which invalidates our conclusion.

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This paper has been withdrawn since it is superated by the latest version of arXiv:0812.1139 (this is the version which will appear in Rend. Circ. Mat. Palermo; it is a strengthening and elaboration of a paper published in Math. Proc. Camb.…

The paper is withdrawn by the authors and replaced be an improved and extended version arxiv: 0812.2968

This paper has been withdrawn, pending revision of the main conclusion, in the light of the criticism of cond-mat/0302043.

This paper has been withdraw by the auhor due to a mistake in classification of the algebra

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This paper has been withdrawn by the author because there are some typos in proofs.

The paper is being withdrawn. A new submission will follow.

This paper has been withdrawn as it has been superseded by 0808.2697