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Matrix Factorizations of the Discriminant of Sn

Matrix factorizations of the discriminant of \(S_n\)
Authors: Faber, E.; Ingalls, C.; May, S.; Talarico, M.;

Matrix Factorizations of the Discriminant of Sn

Abstract

Consider the symmetric group $S_n$ acting as a reflection group on the polynomial ring $k[x_1, \ldots, x_n]$, where $k$ is a field such that Char$(k)$ does not divide $n!$. We use Higher Specht polynomials to construct matrix factorizations of the discriminant of this group action: these matrix factorizations are indexed by partitions of $n$ and respect the decomposition of the coinvariant algebra into isotypical components. The maximal Cohen-Macaulay modules associated to these matrix factorizations give rise to a noncommutative resolution of the discriminant and they correspond to the nontrivial irreducible representations of $S_n$. All our constructions are implemented in Macaulay2 and we provide several examples. We also discuss extensions of these results to Young subgroups of $S_n$.

23 pages, comments welcome!

Country
United Kingdom
Keywords

Matrix factorizations, Maximal Cohen–Macaulay modules, Discriminants of reflection groups, maximal Cohen-Macaulay modules, Cohen-Macaulay modules, Reflection groups, reflection geometries, matrix factorizations, Higher Specht polynomials, Representations of finite symmetric groups, Mathematics - Rings and Algebras, Computational methods for problems pertaining to group theory, Mathematics - Commutative Algebra, Commutative Algebra (math.AC), 13C14, 05E10, 20F55, 20C30, Mathematics - Algebraic Geometry, Reflection and Coxeter groups (group-theoretic aspects), Rings and Algebras (math.RA), Combinatorial aspects of representation theory, FOS: Mathematics, Representation Theory (math.RT), discriminants of reflection groups, Algebraic Geometry (math.AG), Mathematics - Representation Theory, higher Specht polynomials

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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