Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Decay Estimations of Higher Derivatives of Solutions to Nonlinear Dirac
  Equation with Spin Null Structure   We get decay rate of higher derivatives of nonlinear massless Dirac equations
with a kind of "good" spin null form. The method we rely on is similar to that
of Li and Zang. However, they only give the decay rate of solution itself to
nonlinear massless Dirac system.

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The categories of this paper are: hep-th
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The categories of this paper are: funct-an
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The categories of this paper are: econ
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: cs
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: q-bio
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The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph
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The categories of this paper are: q-fin