Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A motivated introduction to character sheaves and the orbit method for
  unipotent groups in positive characteristic   This article is based on lectures given by the authors in 2005 and 2006. Our
first goal is to present an introduction to the orbit method with an emphasis
on the character theory of finite nilpotent groups. The second goal (motivated
by a recent work of G. Lusztig) is to explain several nontrivial aspects of
character theory for finite groups of the form $G(F_{q^n})$, where $G$ is a
unipotent algebraic group over a finite field $F_q$. In particular, we
introduce the notion of a character sheaf for a unipotent group, and provide a
toy model for the representation-theoretic notion of an L-packet.

11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
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The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph