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Comptes Rendus Mathématique
Volume 352, n° 11
pages 881-883 (novembre 2014)
Doi : 10.1016/j.crma.2014.09.018
Received : 3 September 2014 ;  accepted : 23 September 2014
The obstruction to the existence of a loopless star product

Thomas Willwacher 1
 Department of Mathematics, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland 


We show that there is an obstruction to the existence of a star product defined by Kontsevich graphs without directed cycles.

The full text of this article is available in PDF format.

Nous montrons qu'il y a une obstruction à l'éxistence d'une produit étoile défini par les graphes de Kontsevich sans cycle orienté.

The full text of this article is available in PDF format.
1  The author was partially supported by grant PDAMP2_137151 of the Swiss National Science Foundation, and the SwissMAP NCCR, funded by the Swiss National Science Foundation.
2  This is Shoikhet's obstruction, cf. [[6]].

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