Presentations of Schur and Specht modules in characteristic zero

New presentations of Specht modules of symmetric groups over fields of characteristic zero have been obtained by Brauner, Friedmann, Hanlon, Stanley and Wachs. These involve generators that are column tabloids and relations that are Garnir relations with maximal number of exchanges between consecuti...

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Bibliographic Details
Published in:Journal of pure and applied algebra 2025-01, Vol.229 (1), p.107774, Article 107774
Main Authors: Maliakas, Mihalis, Metzaki, Maria, Stergiopoulou, Dimitra-Dionysia
Format: Article
Language:English
Subjects:
Garnir relations
Schur module
Specht module
Symmetric group
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Summary:New presentations of Specht modules of symmetric groups over fields of characteristic zero have been obtained by Brauner, Friedmann, Hanlon, Stanley and Wachs. These involve generators that are column tabloids and relations that are Garnir relations with maximal number of exchanges between consecutive columns or symmetrization of Garnir relations with minimal number of exchanges between consecutive columns. In this paper, we examine Garnir relations and their symmetrization with any number of exchanges. In both cases, we provide sufficient arithmetic conditions so that the corresponding quotient is a Specht module. In particular, in the first case this yields new presentations of Specht modules if the parts of the conjugate partition that correspond to maximal number of exchanges greater than 1 are distinct. These results generalize the presentations mentioned above and offer an answer to a question of Friedmann, Hanlon and Wachs. Our approach is via representations of the general linear group.
ISSN:0022-4049
1873-1376
DOI:10.1016/j.jpaa.2024.107774