Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Numerical study of the generalised Klein-Gordon equations   In this study, we discuss an approximate set of equations describing water
wave propagating in deep water. These generalized Klein-Gordon (gKG) equations
possess a variational formulation, as well as a canonical Hamiltonian and
multi-symplectic structures. Periodic travelling wave solutions are constructed
numerically to high accuracy and compared to a seventh-order Stokes expansion
of the full Euler equations. Then, we propose an efficient pseudo-spectral
discretisation, which allows to assess the stability of travelling waves and
localised wave packets.

33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
15
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: eess
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
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The categories of this paper are: econ
9
The categories of this paper are: nlin
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The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph