Finite-dimensional pointed Hopf algebras with alternating groups are trivial
| Autor: | Andruskiewitsch, N., Fantino, F., Graña, M., Vendramin, L. |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Ann. Mat. Pura Appl. (4) 190 (2011), no. 2, 225-245 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1007/s10231-010-0147-0 |
| Popis: | It is shown that Nichols algebras over alternating groups A_m, m>4, are infinite dimensional. This proves that any complex finite dimensional pointed Hopf algebra with group of group-likes isomorphic to A_m is isomorphic to the group algebra. In a similar fashion, it is shown that the Nichols algebras over the symmetric groups S_m are all infinite-dimensional, except maybe those related to the transpositions considered in [FK], and the class of type (2,3) in S_5. We also show that any simple rack X arising from a symmetric group, with the exception of a small list, collapse, in the sense that the Nichols algebra of (X,q) is infinite dimensional, for q an arbitrary cocycle. arXiv:0904.3978 is included here. Comment: Changes in version 7: We eliminate the Subsection 3.3 and references to type C throughout the paper. We remove Lemma 3.24, Proposition 3.28 and Example 3.29 (old numbering), since they are not needed in the present paper. Several minor mistakes are corrected. The proof of Step 2 in Theorem 4.1 is adjusted |
| Databáze: | arXiv |
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