Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Natural Connections with Totally Skew-Symmetric Torsion on Manifolds
  with Almost Contact 3-Structure and Metrics of Hermitian-Norden Type   It is considered a differentiable manifold equipped with a pseudo-Riemannian
metric and an almost contact 3-struc\-ture so that an almost contact metric
structure and two almost contact B-metric structures are generated. There are
introduced the so-called associated Nijenhuis tensors for the studied
structures. It is given a geometric interpretation of the vanishing of these
tensors as a necessary and sufficient condition for the existence of linear
connections with totally skew-symmetric torsions preserving the structure. An
example of a 7-dimensional manifold with connections of the considered type is
given.

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The categories of this paper are: astro-ph
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The categories of this paper are: stat
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The categories of this paper are: nucl-ex
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The categories of this paper are: physics
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph
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The categories of this paper are: hep-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-th
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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: hep-ph
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The categories of this paper are: plasm-ph