Disconnected Reductive Groups: Classification and Representations
Fuente:
arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866914952490516480 |
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| author | Johnston, Dylan Duro, Diego Martín Rumynin, Dmitriy |
| author_facet | Johnston, Dylan Duro, Diego Martín Rumynin, Dmitriy |
| contents | In this article, we classify disconnected reductive groups over an algebraically closed field with a few caveats. Internal parts of our result are both a classification of finite groups and a classification of integral representations of a fixed finite group. Modulo these classifications - which are impossible in different senses - our main result explicitly tabulates the groups with an efficient algorithm. Besides this, we obtain new results about the representation theory of disconnected reductive groups in characteristic zero. We give two descriptions of their representation rings and prove that their Knutson Index is finite. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_06375 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Disconnected Reductive Groups: Classification and Representations Johnston, Dylan Duro, Diego Martín Rumynin, Dmitriy Representation Theory Group Theory Primary 20G07, Secondary 20E22, 20G05 In this article, we classify disconnected reductive groups over an algebraically closed field with a few caveats. Internal parts of our result are both a classification of finite groups and a classification of integral representations of a fixed finite group. Modulo these classifications - which are impossible in different senses - our main result explicitly tabulates the groups with an efficient algorithm. Besides this, we obtain new results about the representation theory of disconnected reductive groups in characteristic zero. We give two descriptions of their representation rings and prove that their Knutson Index is finite. |
| title | Disconnected Reductive Groups: Classification and Representations |
| topic | Representation Theory Group Theory Primary 20G07, Secondary 20E22, 20G05 |
| url | https://arxiv.org/abs/2409.06375 |