Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Substance-like physical quantities in special relativity   Handling substance-like physical quantities in the limits of special
relativity theory we should make a net distinction between those which present
a proper (rest) magnitude and those which have not. We show how the theory
relates them via relativistic transformation equations.

20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph