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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.

3 votes
1 answer
484 views

What is the current status of representations of $GL_n(F)$ (and other algebraic groups)?

What is the current status of representations of $GL_n(F)$ (and other algebraic groups)? When $F$ is a local field, the representations of $GL_n(F)$ are classified by Bernstein and Zelevinsky in ter …
Jianrong Li's user avatar
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1 vote
0 answers
152 views

What are the differences between p-adic Whittaker functions and archimedean Whittaker functi... [closed]

What are the differences between p-adic Whittaker functions and archimedean Whittaker functions? Are there some references about the differences? Thank you very much.
Jianrong Li's user avatar
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3 votes
1 answer
364 views

References about identities of Gauss sum

I am reading the paper. In the end of page 10, there are the following identities of Gauss sum. \begin{align} & h(b) h(a+b) = q^b h(b) h(a), \\ & h(b) g(a+b) = q^b h(b) g(a), \\ & g(a+b) h(a) h(b) = h …
Jianrong Li's user avatar
  • 6,201
2 votes
0 answers
245 views

Reference request: proofs of the theorems in the paper "On the representation of the group G...

In the paper On the representation of the group $GL(n, K)$ where $K$ is a local field by Gelfand and Kazhdan, it is said that the proofs of the theorems in the paper are published in some other papers …
Jianrong Li's user avatar
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4 votes
0 answers
390 views

Why Whittaker functions are useful?

Whittaker functions appears in Langlands program. Recently, it is shown that some Whittaker functions can be obtained by integrating a function related to decoration over a geometric crystal in http:/ …
Jianrong Li's user avatar
  • 6,201
1 vote

Two questions about Whittaker functions

In the case of $SL_2$, we have $$ U = \left\{ \left(\begin{matrix} 1 & x \\ 0 & 1 \end{matrix}\right) : x \in F \right\} $$ and \begin{align} & \int_U f^0\left( w_0 u t_{\lambda} \right) \psi^{-1}(u) …
Jianrong Li's user avatar
  • 6,201
2 votes
1 answer
399 views

Two questions about Whittaker functions

I am watching the video: Modeling p-adic Whittaker functions, Part I. I have two questions about Whittaker functions in the video. From 33:00 to 37:00, it is said that after changing of variables, w …
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8 votes
1 answer
612 views

Bernstein–Zelevinsky classification for classical groups

Bernstein and Zelevinsky classifies the irreducible complex smooth representations of a general linear group over a local field in terms of cuspidal representations. The irreducible modules are parame …
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8 votes
2 answers
954 views

Relation between representations of p-adic groups and affine Hecke algebras

Let $R_n$ be the category of complex-valued smooth finite-length representations of the group $GL_n(F)$, where $F$ is a local field. By the result of Borel, the subcategory of $R_n$ consisting of repr …
Jianrong Li's user avatar
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2 votes
1 answer
422 views

A computation about Whittaker functions and Eisenstein series

I have some questions about the computation of Eisenstein series and Whittaker functions in the book. The question is on page 29, Theorem 4.3. My questions are in the following. (1) I think that …
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