Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A brief introduction to Cadabra: a tool for tensor computations in
  General Relativity   Cadabra is a powerful computer program for the manipulation of tensor
equations. It was designed for use in high energy physics but its rich
structure and ease of use lends itself well to the routine computations
required in General Relativity. Here we will present a series of simple
examples showing how Cadabra may be used, including verifying that the
Levi-Civita connection is a metric connection and a derivation of the Gauss
equation between induced and ambient curvatures.

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The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
3
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: chem-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: adap-org
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The categories of this paper are: q-fin
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The categories of this paper are: cmp-lg