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Q-system completion is a 3-functor

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arxiv 2106.12437 v1 pith:AJVNMRKF submitted 2021-06-23 math.QA math.CTmath.OA

classification math.QAmath.CTmath.OA
keywords completionq-systemcategoriesdaggerfunctoridempotentpropertyprove
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Q-systems are unitary versions of Frobenius algebra objects which appeared in the theory of subfactors. In recent joint work with R. Hern\'andez Palomares and C. Jones, the authors defined a notion of Q-system completion for C*/W* 2-categories, which is a unitary version of a higher idempotent completion in the spirit of Douglas--Reutter and Gaiotto--Johnson-Freyd. In this article, we prove that Q-system completion is a dagger 3-functor on the dagger 3-category of C*/W* 2-categories. We also prove that Q-system completion satisfies a universal property analogous to the universal property satisfied by idempotent completion for 1-categories.

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  1. Orthonormal bases for higher Hilbert spaces

    math.QA 2026-08 conditional novelty 6.0 of 10

    For finite-dimensional 3-Hilbert spaces, orthonormal bases exist uniquely up to contractible choice, and the Yoneda embedding into the presheaf 3-Hilbert space is an isometric equivalence.

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