Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Coupled Nonlinear Schr\"odinger System with Different Masses   In this letter, I have considered one-dimensional quantum system with
different masses $m$ and $M$, which does not appear integrable in general.
However I have found an exact two-body wave function and due to the extension
of the integrable system to more general system, it was concluded that the
rapidity or quasi-momentum in the integrable system should be regarded as a
modification of velocity rather than that of momentum. I have also considered
the three-body wave function and argued its integrable condition.

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The categories of this paper are: hep-th
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The categories of this paper are: physics
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The categories of this paper are: patt-sol
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The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: econ
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The categories of this paper are: funct-an
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
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The categories of this paper are: cs
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The categories of this paper are: q-bio
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: q-alg