Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A comment on causality   We start from the well-known form of the interval of the special relativity,
stare it, and build up an attempt to implement the causality from it. Some
features appear to be new, they involve the mass of the particle and the
structure of space-time.

13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio