Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sobczyk's simplicial calculus does not have a proper foundation   The pseudoscalars in Garret Sobczyk's paper \emph{Simplicial Calculus with
Geometric Algebra} are not well defined. Therefore his calculus does not have a
proper foundation.

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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: solv-int
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The categories of this paper are: physics
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The categories of this paper are: astro-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: q-bio
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ex