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A Finite Linear Dependence of Discrete Series Multiplicities
- Part of
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- Journal:
- Nagoya Mathematical Journal / Volume 261 / 2026
- Published online by Cambridge University Press:
- 29 September 2026, e51
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- Article
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Let G be the real points of a connected semisimple simply connected algebraic group over ${\mathbb Q}$
such that G has a compact Cartan subgroup and let $\Gamma $
be a uniform lattice in G. Let $\widehat {G}_d$
denote the set of equivalence classes of unitary discrete series representations of G. We prove that for any finite subset of $\widehat {G}_d$
satisfying a certain condition, the associated finite set of discrete series multiplicities in $L^2(\Gamma \backslash G)$
determines all discrete series multiplicities in $L^2(\Gamma \backslash G)$
. This allows us to obtain a refinement of the strong multiplicity one result for discrete series representations. As an application, we deduce that for two given levels, the equality of the dimensions of the spaces of cusp forms over a suitable finite set of weights implies the equality of the dimensions of the spaces of cusp forms for all weights.
