Related papers: Derived category and Lie algebras

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This paper has been withdrawn by the authors due to some fatal errors in the analysis.

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This paper has been withdrawn by the author because the conclusions reached in it are incorrect.

This paper has been withdrawn by the author: it was a too preliminary version.

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Withdrawn paper because the results are published in math.AT/0308054 and math.AT/0308063.

This paper has been withdrawn by the author due to serious error found in main argument.

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This paper has been withdrawn by the authors.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.

This paper has been withdrawn by the authors because the paper is largely revised and improved, and to appear in Mechanics Research Communications.

This paper has been withdrawn by the author due to new results to be added.

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This paper has been withdrawn by the author, due to errors in the figures.

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This paper has been withdrawn by the author due to an error in the proof.