Let $E/F$ be a quadratic extension of non-archimedean local fields, and let $\ell$ be a prime number different from the residual characteristic of $F$. For a complex cuspidal representation $\pi$ of $GL(n,E)$, the Asai $L$-factor $L^+(X,\pi)$ has a pole at $X=1$ if and only if $\pi$ is $GL(n,F)$-distinguished... (read more)

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