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An automorphic form is a well-behaved function from a topological group $G$ to the complex numbers (or complex vector space) which is invariant under the action of a discrete subgroup $\Gamma \subset G$ of the topological group. Automorphic forms are a generalization of the idea of periodic functions in Euclidean space to general topological groups.

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cuspidal kernel function

Let $G$ be a reductive group over some number field $F$ and $\pi$ an irreducible cuspidal automorphic representation of $G(\mathbb{A}_F)$. Let $f$ be a compactly supported function on $G(\mathbb{A}_F) …
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