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Singularities of locally acyclic cluster algebras

We show that locally acyclic cluster algebras have (at worst) canonical singularities. In fact, we prove that locally acyclic cluster algebras of positive characteristic are strongly F-regular. In addition, we show that upper cluster algebras are always Frobenius split by a canonically defined splitting, and that they have a free canonical module of rank one. We also give examples to show that not all upper cluster algebras are F-regular if the local acyclicity is dropped.

preprint2014arXivOpen access
Angélica BenitoGreg MullerJenna RajchgotKaren E. Smith
math.ACmath.AG
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Angélica BenitoGreg MullerJenna RajchgotKaren E. Smith

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