Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Newman Tamburino solutions with an aligned Maxwell field   We prove that there exists no aligned Einstein Maxwell generalization of the
spherical class of Newman Tamburino solutions. The presence of an aligned
Maxwell field automatically leads to the cylindrical class.

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The categories of this paper are: math-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: eess
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg
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The categories of this paper are: quant-ph
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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: comp-gas
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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: chem-ph
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The categories of this paper are: econ
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The categories of this paper are: nlin
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The categories of this paper are: nucl-ex