Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Introduction to Special Relativity   The goal of this lecture is to introduce the student to the theory of Special
Relativity. Not to overload the content with mathematics, the author will stick
to the simplest cases; in particular only reference frames using Cartesian
coordinates and translating along the common x-axis as in Fig. 1 will be used.
The general expressions will be quoted or may be found in the cited literature.

21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys