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Multiplicative Structures and the Twisted Baum-Connes Assembly map

Using a combination of Atiyah-Segal ideas on one side and of Connes and Baum-Connes ideas on the other, we prove that the Twisted geometric K-homology groups of a Lie groupoid have an external multiplicative structure extending hence the external product structures for proper cases considered by Adem-Ruan in [1] or by Tu,Xu and Laurent-Gengoux in [24]. These Twisted geometric K-homology groups are the left hand sides of the twisted geometric Baum-Connes assembly maps recently constructed in [9] and hence one can transfer the multiplicative structure via the Baum-Connes map to the Twisted K-theory groups whenever this assembly maps are isomorphisms.

preprint2016arXivOpen access
Noé BárcenasPaulo Carrillo RouseMario Velásquez
math.KT
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Noé BárcenasPaulo Carrillo RouseMario Velásquez

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