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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| Accesso online: | https://arxiv.org/abs/2502.13709 |
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| _version_ | 1866917489407950848 |
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| author | Bobiński, Grzegorz Schröer, Jan |
| author_facet | Bobiński, Grzegorz Schröer, Jan |
| contents | In the representation theory of finite-dimensional algebras, the study of projective presentations of maximal rank is closely related to the study of generically $τ$-regular irreducible components of varieties of modules over such algebras. We show that a module is $τ$-regular if and only if its minimal projective presentation is of maximal rank. This is a refinement of a theorem by Plamondon. We prove that generic extensions of generically $τ$-regular components by simple projective modules are again generically $τ$-regular. This leads to the classification of all generically $τ$-regular components for triangular algebras. We also show that an algebra is hereditary if and only if all irreducible components of its varieties of modules are generically $τ$-regular. Finally, we discuss when the set of generically $τ$-regular components coincides with the set of generically $τ^-$-regular components. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_13709 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Generically $τ$-regular irreducible components of module varieties Bobiński, Grzegorz Schröer, Jan Representation Theory In the representation theory of finite-dimensional algebras, the study of projective presentations of maximal rank is closely related to the study of generically $τ$-regular irreducible components of varieties of modules over such algebras. We show that a module is $τ$-regular if and only if its minimal projective presentation is of maximal rank. This is a refinement of a theorem by Plamondon. We prove that generic extensions of generically $τ$-regular components by simple projective modules are again generically $τ$-regular. This leads to the classification of all generically $τ$-regular components for triangular algebras. We also show that an algebra is hereditary if and only if all irreducible components of its varieties of modules are generically $τ$-regular. Finally, we discuss when the set of generically $τ$-regular components coincides with the set of generically $τ^-$-regular components. |
| title | Generically $τ$-regular irreducible components of module varieties |
| topic | Representation Theory |
| url | https://arxiv.org/abs/2502.13709 |