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Regular categories, oligomorphic monoids, and tensor categories

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arxiv 2403.16267 v1 pith:SCMVLUCM submitted 2024-03-24 math.RT math.CT

classification math.RTmath.CT
keywords categoryoligomorphicregularcategoriestensorassociatedconstructedequipped
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abstract

Knop constructed a tensor category associated to a finitely-powered regular category equipped with a degree function. In recent work with Harman, we constructed a tensor category associated to an oligomorphic group equipped with a measure. In this paper, we explain how Knop's approach fits into our theory. The first, and most important, step describes finitely-powered regular categories in terms of oligomorphic monoids; this may be of independent interest. We go on to examine some aspects of this construction when the regular category one starts with is the category of $G$-sets for an oligomorphic group $G$, which yields some interesting examples.

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Cited by 1 Pith paper

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  1. Classical interpolation categories

    math.RT 2025-07 conditional novelty 7.0 of 10

    Ultraproduct and oligomorphic-group constructions of interpolation categories for finite classical groups agree, and the categories depend only on a parameter t, with an additional parity label in the orthogonal case.

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