Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An external approach to unitary representations   The main aim of this paper is to present the ideas which lead first to the
solution of the unitarizability problem for $\GL(n)$ over nonarchimedean local
fields and to the recognition that the same result holds over archimedean local
fields, a result which was proved by Vogan using an internal approach. Let us
say that the approach that we are going to present may be characterized as
external. At no point do we go into the internal structure of representations.

12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph