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On the tensor product of well generated dg categories. (English) Zbl 1472.18010

Summary: We endow the homotopy category of well generated (pretriangulated) dg categories with a tensor product satisfying a universal property. The resulting monoidal structure is symmetric and closed with respect to the cocontinuous RHom of dg categories (in the sense of B. Toën [Invent. Math. 167, No. 3, 615–667 (2007; Zbl 1118.18010)]). We give a construction of the tensor product in terms of localisations of dg derived categories, making use of the enhanced derived Gabriel-Popescu theorem [M. Porta, Adv. Math. 225, No. 3, 1669–1715 (2010; Zbl 1227.18011)]. Given a regular cardinal \(\alpha\), we define and construct a tensor product of homotopically \(\alpha\)-cocomplete dg categories and prove that the well generated tensor product of \(\alpha\)-continuous derived dg categories (in the sense of Porta [loc. cit.]) is the \(\alpha\)-continuous dg derived category of the homotopically \(\alpha\)-cocomplete tensor product. In particular, this shows that the tensor product of well generated dg categories preserves \(\alpha\)-compactness.

MSC:

18G80 Derived categories, triangulated categories
18G35 Chain complexes (category-theoretic aspects), dg categories
18M05 Monoidal categories, symmetric monoidal categories
18E35 Localization of categories, calculus of fractions

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