Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Revisitation of a Tartar's result on a semilinear hyperbolic system with
  null condition   We revisit a method introduced by Tartar for proving global well-posedness of
a semilinear hyperbolic system with null quadratic source in one space
dimension. A remarkable point is that, since no dispersion effect is available
for 1D hyperbolic systems, Tartar's approach is entirely based on spatial
localization and finite speed of propagation.

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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
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The categories of this paper are: q-fin
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The categories of this paper are: supr-con
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The categories of this paper are: bayes-an
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The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg