Universal abstract elementary classes and locally multipresentable categories

Lieberman, Michael; Rosický, Jiří; Vasey, Sebastien

doi:10.1090/proc/14326

Universal abstract elementary classes and locally multipresentable categories
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by Michael Lieberman, Jiří Rosický and Sebastien Vasey PDF

Proc. Amer. Math. Soc. 147 (2019), 1283-1298 Request permission

Abstract:

We exhibit an equivalence between the model-theoretic framework of universal classes and the category-theoretic framework of locally multipresentable categories. We similarly give an equivalence between abstract elementary classes (AECs) admitting intersections and locally polypresentable categories. We use these results to shed light on Shelah’s presentation theorem for AECs.

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