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

Orlov's famous representability theorem asserts that any fully faithful exact functor between the bounded 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

Visitantes florais do algodoeiro Gossypium hirsutum em Quixeramobim e Quixeré no Estado do Ceará.

O objetivo deste estudo foi investigar os visitantes florais em áreas de algodoeiro comercial, cultivar 187 8R, nos municípios de Quixeramobim e Quixeré, Ceará