Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Almost Contact Metric Structures Induced by $G_2$ Structures   We study almost contact metric structures induced by 2-fold vector cross
products on manifolds with $G_2$ structures. We get some results on possible
classes of almost contact metric structures. Finally we give examples.

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The categories of this paper are: hep-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: cs
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: supr-con
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The categories of this paper are: astro-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: gr-qc
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The categories of this paper are: solv-int