Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonexistence of smooth solutions for the general compressible Ericksen
  -- Leslie equations in three dimensions   We prove that the smooth solutions to the Cauchy problem for the compressible
general three-dimensional Ericksen--Leslie system modeling nematic liquid
crystal flow with conserved mass, linear momentum, and dissipating total
energy, generally lose classical smoothness within a finite time.

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The categories of this paper are: nucl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: cond-mat
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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: cs
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The categories of this paper are: nlin
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The categories of this paper are: chem-ph
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The categories of this paper are: econ
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The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int