Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Properties of Extensive Air Showers   Some general properties of extensive air showers are discussed. The main
focus is put on the longitudinal development, in particular the energy flow,
and on the lateral distribution of different air shower components. The
intention of the paper is to provide a basic introduction to the subject rather
than a comprehensive review.

14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs