Abstract
Let be a complex semisimple Lie algebra with Borel subalgebra
and corresponding nilradical
. We show that singular Whittaker modules M are simple if and only if the space
of Whittaker vectors is 1-dimensional. For arbitrary locally
-finite
-modules V, an immediate corollary is that the dimension of
is bounded by the composition length of V.
2020 MATHEMATICS SUBJECT CLASSIFICATION:
Acknowledgments
This paper is the result of a MITACS Globalink undergraduate research internship held by Dulam, Ghate, and Pathak in Summer 2023 under the direction of Lau at Université Laval. The authors also thank Charlotte Lavoie-Bel for many useful discussions throughout the summer.
Disclosure statement
The authors report that there are no competing interests to declare.