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Q-systems and compact W*-algebra objects

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arxiv 1707.02155 v1 pith:LW2LPFDS submitted 2017-07-07 math.OA math.CTmath.QA

classification math.OAmath.CTmath.QA
keywords algebraobjectscompactconnectedq-systemsalthougharticlecategorical
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We show that given a rigid C*-tensor category, there is an equivalence of categories between normalized irreducible Q-systems, also known as connected unitary Frobenius algebra objects, and compact connected W*-algebra objects. Although this result could be proved as a corollary of our previous article on realizations of algebra objects and discrete subfactors, we prove it here directly via categorical methods without passing through subfactor theory.

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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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