Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Three Views of a Secret in Relativistic Thermodynamics   It has been shown three different views in relativistic thermodynamics can be
derived from the basic formulation proposed by van Kampen and Israel. The way
to decompose energy-momentum into the reversible and irreversible parts is not
uniquely determined, and different choices result in different views. The
effect of difference in the definition of a finite volume is also considered.

31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th