Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Holonomy algebras of Einstein pseudo-Riemannian manifolds   The holonomy algebras of Einstein not Ricci-flat pseudo-Riemannian manifolds
of arbitrary signature are classified. As illustrating examples, the cases of
Lorentzian manifolds, pseudo-Riemannian manifolds of signature $(2,n)$ and the
para-quaternionic-K\"ahlerian manifolds with non-zero scalar curvature are
considered. Einstein not Ricci-flat metrics of signature $(2,n)$ with all
possible holonomy algebras are given.

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The categories of this paper are: hep-th
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The categories of this paper are: quant-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: plasm-ph
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The categories of this paper are: nlin
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: astro-ph
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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: ao-sci