Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Index theorem for inhomogeneous hypoelliptic differential operators   We prove an index theorem for inhomogeneous differential operators satisfying
the Rockland condition (hence hypoelliptic). This theorem extends an index
theorem for contact manifolds by Van-Erp.

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The categories of this paper are: supr-con
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-th
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: eess
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The categories of this paper are: cs
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The categories of this paper are: quant-ph