Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the dispersionless Davey-Stewartson system: Hamiltonian vector fields
  Lax pair and relevant nonlinear Riemann-Hilbert problem for dDS-II system   In this paper, the semiclassical limit of Davey-Stewartson systems are
studied. It shows that these dispersionless limited integrable systems of
hydrodynamic type, which are defined as dDS (dispersionless Davey-Stewartson)
systems, are arisen from the commutation condition of Lax pairs of
one-parameter vector fields. The relevant nonlinear Riemann-Hilbert problems
with some symmetries for the dDS-II system are also constructed. This kind of
Riemann-Hilbert problems are meaningful for applying the formal inverse
scattering transform method, recently developed by Manakov and Santini, to
study the dDS-II system .

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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol
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The categories of this paper are: cond-mat
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The categories of this paper are: math-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ph
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The categories of this paper are: cs
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The categories of this paper are: atom-ph
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The categories of this paper are: solv-int
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The categories of this paper are: eess