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Zbl 1206.20004
Garge, Shripad M.; Oesterlé, Joseph
On Gelfand models for finite Coxeter groups. (English)
[J] J. Group Theory 13, No. 3, 429-439 (2010). ISSN 1433-5883; ISSN 1435-4446/e

Summary: A Gelfand model for a finite group $G$ is a complex linear representation of $G$ that contains each of its irreducible representations with multiplicity one. For a finite group $G$ with a faithful representation $V$, one constructs a representation which we call the polynomial model for $G$ associated to $V$. Araujo and others have proved that the polynomial models for certain irreducible Weyl groups associated to their canonical representations are Gelfand models.\par In this paper, we give an easier and uniform treatment for the study of the polynomial model for a general finite Coxeter group associated to its canonical representation. Our final result is that such a polynomial model for a finite Coxeter group $G$ is a Gelfand model if and only if $G$ has no direct factor of the type $W(D_{2n})$, $W(E_7)$ or $W(E_8)$.

MSC 2000:: *20C15 Ordinary representations and characters of groups
20F55 Coxeter groups

Keywords: Gelfand models; finite Coxeter groups; polynomial models; irreducible representations

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Zentralblatt MATH Berlin [Germany]