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# Characters and conjugacy classes of the symmetric group

3 POLKA - Polynomials, Combinatorics, Arithmetic
INRIA Lorraine, LORIA - Laboratoire Lorrain de Recherche en Informatique et ses Applications
Abstract : This article addresses several conjectures due to Jacob Katriel concerning conjugacy classes of $\S{n}$ viewed as operators acting by multiplication. The first conjecture expresses, for a fixed partition $\r$ of the form $r1^{n-r}$, the eigenvalues (or central characters) $\eo\r\l$ in terms of contents of $\l$. While Katriel conjectured a generic form and an algorithm to compute missing coefficients, we provide an explicit expression. The second conjecture (presented at FPSAC'98 in Toronto) gives a general form for the expression of a conjugacy class in terms of \emph{elementary} operators. We prove it using a convenient description by differential operators acting on symmetric polynomials. To conclude, we partially extend our results on $\eo\r\l$ to arbitrary partitions $\r$. || Nous démontrons plusieurs conjectures dues à Jacob Katriel qui portent sur les classes de conjugaisons de $\S{n}$ vues comme opérateurs agissant par multiplication. La première conjecture exprime, pour une partition fixée $\rho$ de la forme $r1^{n-r}$, le
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https://hal.inria.fr/inria-00098749
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Submitted on : Tuesday, September 26, 2006 - 8:32:52 AM
Last modification on : Friday, February 4, 2022 - 3:30:26 AM
Long-term archiving on: : Friday, November 25, 2016 - 11:56:26 AM

### Identifiers

• HAL Id : inria-00098749, version 1

### Citation

Alain Goupil, Dominique Poulalhon, Gilles Schaeffer. Characters and conjugacy classes of the symmetric group. [Intern report] 99-R-349 || goupil99a, 1999, 12 p. ⟨inria-00098749⟩

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