Krull-Gabriel dimension of Skew group algebras
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866915735880597504 |
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| author | Sardar, Shantanu |
| author_facet | Sardar, Shantanu |
| contents | For an algebraically closed field K, let G be a finite abelian group of K-linear automorphisms of a finite-dimensional algebra A and AG is the associated skew group algebra. The author with S. Trepode and A. G. Chaio introduced the notion of a Galois semi-covering functor to study the irreducible morphisms over skew group algebras. In this paper, we establish a Galois semi-covering functor between the morphism categories as well as the functor categories over the algebras A and AG and prove that their Krull-Gabriel dimension are equal. This computation confirms Prests conjecture on the finiteness of Krull-Gabriel dimension and Schroers conjecture on its connection with the stable rank (the least stabilized radical power) over skew gentle algebras. Moreover, we determine all posible stable ranks for (skew) Brauer graph algebras. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_11512 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Krull-Gabriel dimension of Skew group algebras Sardar, Shantanu Representation Theory Category Theory Rings and Algebras 16, 18 For an algebraically closed field K, let G be a finite abelian group of K-linear automorphisms of a finite-dimensional algebra A and AG is the associated skew group algebra. The author with S. Trepode and A. G. Chaio introduced the notion of a Galois semi-covering functor to study the irreducible morphisms over skew group algebras. In this paper, we establish a Galois semi-covering functor between the morphism categories as well as the functor categories over the algebras A and AG and prove that their Krull-Gabriel dimension are equal. This computation confirms Prests conjecture on the finiteness of Krull-Gabriel dimension and Schroers conjecture on its connection with the stable rank (the least stabilized radical power) over skew gentle algebras. Moreover, we determine all posible stable ranks for (skew) Brauer graph algebras. |
| title | Krull-Gabriel dimension of Skew group algebras |
| topic | Representation Theory Category Theory Rings and Algebras 16, 18 |
| url | https://arxiv.org/abs/2601.11512 |