Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 2D Gravity with Torsion, Oriented Matroids and 2+2 Dimensions   We find a link between oriented matroid theory and 2d gravity with torsion.
Our considerations may be useful in the context of noncommutative phase space
in a target spacetime of signature (2+2) and in a possible theory of gravity
ramification.

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The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: eess
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The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas