The residual spectrum of 𝑈(2,2)

Kon-No, Takyua

doi:10.1090/S0002-9947-98-01707-3

The residual spectrum of $U(2,2)$
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by Takyua Kon-No

Trans. Amer. Math. Soc. 350 (1998), 1285-1358

DOI: https://doi.org/10.1090/S0002-9947-98-01707-3

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Abstract:

Let $G$ be the quasi-split unitary group $U(2,2)_{k’/k}$ of four variables attached to a quadratic extension $k’/k$ of number fields. An irreducible decomposition of the non-cuspidal discrete spectrum of $L^2$-automorphic forms of $G$ is obtained.

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