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A Graded Schur Lemma and a graded-monoidal structure for induced modules over graded-commutative algebras
Stockholm University, Faculty of Science, Department of Mathematics.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

We consider algebras and Frobenius algebras, internal to a monoidal category, that are graded over a finite abelian group. For the case that A is a twisted group algebra in a linear abelian monoidal category we obtain a graded generalization of the Schur Lemma for the category of induced A-modules. We further show that if the monoidal category is braided and A is commutative up to a bicharacter of the grading group, then the category of induced A-modules can be endowed with a graded-monoidal structure that is twisted by the bicharacter. In the particular case that the grading group is Z/2Z, these findings reproduce known results about superalgebras and super-monoidal structures. 

Keywords [en]
Quantum Algebra, Category Theory, Supercategories
National Category
Mathematics
Research subject
Mathematics; Physics
Identifiers
URN: urn:nbn:se:su:diva-232733OAI: oai:DiVA.org:su-232733DiVA, id: diva2:1891461
Available from: 2024-08-22 Created: 2024-08-22 Last updated: 2024-08-22
In thesis
1. The Art of Bad Art: Diagrammatics in Mathematical Physics
Open this publication in new window or tab >>The Art of Bad Art: Diagrammatics in Mathematical Physics
2024 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The purpose of a proof is to reduce the complexity of a statement until it becomes a sequence of trivialities. To this end, the choice of notation, diagrams and overall paradigm can aid in conveying large amounts of information in a simple manner. This compilation thesis focuses on the choice of visual tools to convey algebraic results in the context of mathematical physics, using a categorical paradigm with various topological semantics. The topics range from covering known results in knot theory, abstract diagram categories and low-dimensional topological quantum field theory, to novel results such as the topological rack exclusion principle, tetrahedral symmetry of framed associators and new diagrammatics for graded-monoidal categories based on the Kleisli presentation.We demonstrate how these diagrammatic methods can be used to simplify algebraic proofs and communicate across disciplines.

Place, publisher, year, edition, pages
Stockholm: Department of Mathematics, Stockholm University, 2024. p. 38
Keywords
Quantum Algebra, Category Theory, Supercategories, Knot Theory, Mathematical Physics, TQFT
National Category
Mathematics
Research subject
Mathematics
Identifiers
urn:nbn:se:su:diva-232734 (URN)978-91-8014-907-5 (ISBN)978-91-8014-908-2 (ISBN)
Public defence
2024-09-25, lärosal 17, hus 2, plan 2, Albano, Albanovägen 20, Stockholm, 13:00 (English)
Opponent
Supervisors
Available from: 2024-09-02 Created: 2024-08-22 Last updated: 2024-08-27Bibliographically approved

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https://arxiv.org/abs/2403.10366
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