Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Shower Center of Gravity and Hadronic Interaction Characteristics   Equations for the center of gravity of the shower originated by high energy
proton in the atmosphere are written and, within certain simplifications,
solved for the case of logarithmically decreasing interaction length of hadrons
in the air. Obtained expression provides transparent view of the way in which
hadronic interaction characteristics determine the longitudinal shower
development.

4
The categories of this paper are: cond-mat
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
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The categories of this paper are: nlin
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The categories of this paper are: bayes-an
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The categories of this paper are: supr-con
16
The categories of this paper are: stat