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Distinguishing derived equivalence classes using the second Hochschild cohomology group

Deena Al-Kadi — 2010

Colloquium Mathematicae

We study the second Hochschild cohomology group of the preprojective algebra of type D₄ over an algebraically closed field K of characteristic 2. We also calculate the second Hochschild cohomology group of a non-standard algebra which arises as a socle deformation of this preprojective algebra and so show that the two algebras are not derived equivalent. This answers a question raised by Holm and Skowroński.

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