Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On dispersionless Hirota type equations   Dispersionless Hirota type equations are extracted from the dispersionless
limit of the Fay differential identity due to Takasaki- Takebe. A few other
results are sketched between inverse scattering, dKdV, and gravity.

5
The categories of this paper are: gr-qc
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The categories of this paper are: alg-geom
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th
18
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: math-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: math
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: solv-int