Niels Kowalzig und Ext And Tor Person-Info 

( Ich bin Niels Kowalzig)
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On the algebraic structure of Ext and Tor

warwick.ac.uk
... that the cohomology ring of a Calabi–Yau algebra is a Batalin–Vilkovisky algebra is extended to twisted Calabi–Yau algebras. (joint work with Niels Kowalzig)
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