Spectra of symmetrized shuffling operators

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Bibliographic Information

Spectra of symmetrized shuffling operators

Victor Reiner, Franco Saliola, Volkmar Welker

(Memoirs of the American Mathematical Society, no. 1072)

American Mathematical Society, c2013

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Note

"March 2014, volume 228, number 1072 (fourth of 5 numbers)."

Includes bibliographical references (p. 99-102) and index

Description and Table of Contents

Description

For a finite real reflection group W and a W -orbit O of flats in its reflection arrangement - or equivalently a conjugacy class of its parabolic subgroups - the authors introduce a statistic noninv O (w) on w in W that counts the number of ""O -noninversions"" of w . This generalises the classical (non-)inversion statistic for permutations w in the symmetric group S n. The authors then study the operator ? O of right-multiplication within the group algebra CW by the element that has noninv O (w) as its coefficient on w.

Table of Contents

Introduction Defining the operators The case where O contains only hyperplanes Equivariant theory of BHR random walks The family ? (2 k ,1 n?2k) The original family ? (k,1 n?k) Acknowledgements Appendix A. G n -module decomposition of ? (k,1 n?k) Bibliography List of Symbols Index

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