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Split Spetses for Primitive Reflection Groups
Michel Broué, Université Paris VII, France, Gunter Malle, TU Kaiserslautern, Germany, and Jean Michel, Université Paris VII, France
A publication of the Société Mathématique de France.
2014; 146 pp; softcover
Number: 359
ISBN-10: 2-85629-781-1
ISBN-13: 978-2-85629-781-0
List Price: US$63
Member Price: US$50.40
Order Code: AST/359
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Let \(W\) be an exceptional spetsial irreducible reflection group acting on a complex vector space \(V\), i.e., a group \(G{_n}\) for \[n \in 4, 6, 8, 14, 23, 24, 25, 26, 27, 28, 29, 30, 32, 33, 34, 35, 36, 37\] in the Shephard-Todd notation.

The authors describe how to determine some data associated to the corresponding (split) "spets" \(\mathbb{G} =(V,W)\), given complete knowledge of the same data for all proper subspetses (the method is thus inductive).

The data determined here are the set \(\mathrm{Uch}(\mathbb{G})\) of "unipotent characters" of \(\mathbb{G}\) and its repartition into families, as well as the associated set of Frobenius eigenvalues. The determination of the Fourier matrices linking unipotent characters and "unipotent character sheaves" will be given in another paper.

The approach works for all split reflection cosets for primitive irreducible reflection groups. The result is that all the above data exist and are unique (note that the cuspidal unipotent degrees are only determined up to sign).

The authors keep track of the complete list of axioms used. In order to do that, they explain in detail some general axioms of "spetses", generalizing (and sometimes correcting) along the way.

A publication of the Société Mathématique de France, Marseilles (SMF), distributed by the AMS in the U.S., Canada, and Mexico. Orders from other countries should be sent to the SMF. Members of the SMF receive a 30% discount from list.


Graduate students and research mathematicians interested in complex reflection groups, braid groups, Hecke algebras, finite reductive groups, and spetses.

Table of Contents

From Weyl groups to complex reflection groups
  • Reflection groups, braid groups, Hecke algebras
  • Complements on finite reductive groups
  • Spetsial \(\Phi\)-cyclotomic Hecke algebras
  • Axioms for spetses
  • Determination of \(\mathrm{Uch}(\mathbb{G}):\) the algorithm
  • Appendix A
  • Appendix B
  • Bibliography
  • Index
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