Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Well-posedness for the Cauchy problem of the Klein-Gordon-Zakharov
  system in 2D   This paper is concerned with the Cauchy problem of $2$D Klein-Gordon-Zakharov
system with very low regularity initial data. We prove the bilinear estimates
which are crucial to get the local in time well-posedness. The estimates are
established by the Fourier restriction norm method. We utilize the bilinear
Strichartz estimates and the nonlinear version of the classical Loomis-Whitney
inequality which was applied to Zakharov system.

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The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
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The categories of this paper are: eess
36
The categories of this paper are: cmp-lg