Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Summary Report for the $e^- e^-$ session in LCWS 2004   In this talk, I summarize the activities in the $e^- e^-$ session. The
consensus is that if the next generation $e^+ e^-$ linear collider wants to
include an $e^- e^-$ option, the planning has to include it as early as
possible. By doing so the extra cost would be only a small fraction of the
total, and of course the physics potential would be very rewarding.

16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat