Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relativistic NN scattering equations without partial-wave decomposition   Relativistic quasi-potential equations describing NN scattering are compared.
Within the spectator formalism a cancellation is seen to occur between
retardation and negative-energy effects.

31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph