Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Extremely High Energy and Violation of Lorentz Invariance   Extremely high-energy(EHE) cosmic rays might provide a chance to check a
violation of the Lorentz symmetry of spacetime. Some theoretical consideration
is described about why the Lorentz symmetry might break-down in EHE phenomena
in this universe. Some models which introduce the violation of the Lorentz
symmetry will be discussed.

21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex