Abstract
Let M be a Poisson manifold. Kontsevich proved that star products exist on M and he gave a classification. To relate his classification with other classifications, one could try to extend the Connes–Flato–Sternheimer invariant to a general Poisson manifold. We show how generalization of this invariant is related to the formality conjecture for chains. Finally, we show how to prove those conjectures ‘step by step’. Our approach, different from Tamarkin's, will give explicit formulas but doesn't yet solve the general conjecture.
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