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Lie Affgebras Vis-à-Vis Lie Algebras
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Krzysztof Radziszewski
Results in Mathematics, Volume: 80, Issue: 2, Start page: 61
Swansea University Author:
Tomasz Brzezinski
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DOI (Published version): 10.1007/s00025-025-02377-7
Abstract
It is shown that any Lie affgebra, that is an algebraic system consisting of an affine space together with a bi-affine multiplication satisfying affine versions of the antisymmetry and Jacobi identity, is isomorphic to a Lie algebra together with an element and a specific generalized derivation (in...
| Published in: | Results in Mathematics |
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| ISSN: | 1422-6383 1420-9012 |
| Published: |
Springer Nature
2025
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| Online Access: |
Check full text
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa68951 |
| Abstract: |
It is shown that any Lie affgebra, that is an algebraic system consisting of an affine space together with a bi-affine multiplication satisfying affine versions of the antisymmetry and Jacobi identity, is isomorphic to a Lie algebra together with an element and a specific generalized derivation (in the sense of Leger and Luks in J Algebra 228:165–203, 2000). These Lie algebraic data can be taken for the construction of a Lie affgebra or, conversely, they can be uniquely derived for any Lie algebra fibre of the Lie affgebra. The close relationship between Lie affgebras and (enriched by the additional data) Lie algebras can be employed to attempt a classification of the former by the latter. In particular, up to isomorphism, a complex Lie affgebra with a simple Lie algebra fibre is fully determined by a scalar and an element of fixed up to an automorphism of , and it can be universally embedded in a trivial extension of by a derivation. The study is illustrated by a number of examples that include all Lie affgebras with one-dimensional, non-abelian two-dimensional, and Lie algebra fibres. Extensions of Lie affgebras by cocycles and their relation to cocycle extensions of tangent Lie algebras is briefly discussed and illustrated by Lie affgebras with the Witt and Virasoro algebra fibres. |
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| Keywords: |
Lie algebra; Lie affgebra; generalized derivation; quasicentroid |
| College: |
Faculty of Science and Engineering |
| Funders: |
The research of Tomasz Brzeziński and Krzysztof Radziszewski is partially supported by the National Science Centre, Poland, through the WEAVE-UNISONO grant no. 2023/05/Y/ST1/00046. |
| Issue: |
2 |
| Start Page: |
61 |