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Scalar extensions of derived categories and non-Fourier-Mukai functors

Orlov's famous representability theorem asserts that any fully faithful functor between the derived categories of coherent sheaves on smooth projective varieties is a Fourier-Mukai functor. This result has been extended by Lunts and Orlov to include functors from perfect complexes to quasi-coherent complexes. In this paper we show that the latter extension is false without the full faithfulness hypothesis. Our results are based on the properties of scalar extensions of derived categories, whose investigation was started by Pawel Sosna and the first author.

preprint2015arXivOpen access
Alice RizzardoMichel Van den Bergh
math.AG
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Alice RizzardoMichel Van den Bergh

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