Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: NNexus Reloaded   Interlinking knowledge is one of the cornerstones of online collaboration.
While wiki systems typically rely on links supplied by authors, in the early
2000s the mathematics encyclopedia at PlanetMath.org introduced a feature that
provides automatic linking for previously defined concepts. The NNexus software
suite was developed to support the necessary subtasks of concept indexing,
concept discovery and link-annotation. In this paper, we describe our recent
reimplementation and revisioning of the NNexus system.

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The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: physics
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph