Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relativistic dynamics without conservation laws   We show that relativistic dynamics can be approached without using
conservation laws (conservation of momentum, of energy and of the centre of
mass). Our approach avoids collisions that are not easy to teach without
mnemonic aids. The derivations are based on the principle of relativity and on
its direct consequence, the addition law of relativistic velocities.

1
The categories of this paper are: cs
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph