Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Numerical calculation of N-periodic wave solutions to coupled KdV-type
  equations   In this paper, we study periodic wave solutions of coupled KdV-type
equations. We present a numerical process to calculate the $N$-periodic waves
based on the direct method of calculating periodic wave solutions proposed by
Akira Nakamura. Particularly, in the case of $N=1,2,3$, we give some detailed
examples to show the N-periodic wave solutions to a coupled Ramani equation.

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The categories of this paper are: cs
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The categories of this paper are: cond-mat
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The categories of this paper are: astro-ph
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The categories of this paper are: econ
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The categories of this paper are: q-bio
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The categories of this paper are: adap-org
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
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The categories of this paper are: physics
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The categories of this paper are: cmp-lg
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-th