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Semisimple and separable algebras in multi-fusion categories

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arxiv 1706.06904 v2 pith:3EDG6G3K submitted 2017-06-21 math.QA

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keywords algebrassemisimplemulti-fusionseparablealgebracategoryclassicalfield
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We give a classification of semisimple and separable algebras in a multi-fusion category over an arbitrary field in analogy to Wedderben-Artin theorem in classical algebras. It turns out that, if the multi-fusion category admits a semisimple Drinfeld center, the only obstruction to the separability of a semisimple algebra arises from inseparable field extensions as in classical algebras. Among others, we show that a division algebra is separable if and only if it has a nonvanishing dimension.

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Cited by 2 Pith papers

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  1. Generalized comodule tube algebras for boundary and domain wall defects of (2+1)D topological order

    hep-th 2026-08 conditional novelty 7.0 of 10

    Codimension-2 defects in 2+1D topological order are classified by representations of new comodule tube algebras over the weak Hopf tube algebras of boundary and domain wall excitations.

  2. Gauging Non-Invertible Symmetries in (2+1)d Topological Orders

    hep-th 2025-07 conditional novelty 7.0 of 10

    A framework for gauging non-invertible symmetries in (2+1)d TQFTs, unifying 0-form and 1-form gauging via surface algebras, with constraints and toric-code examples.

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