Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relativistic Bound States in 2+1 and 1+1 Dimensions in the Null-Plane   The Relativistic formulation of the three-boson model interacting via a
zero-range two-body force in the null-plane is given in 2+1 and 1+1 space-time
dimension. The bound state energy is calculed as function of the two-body boson
binding energy.

26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int