Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Computing the writhe of a knot   We study the variation of the Tait number of a closed space curve according
to its different projections. The results are used to compute the writhe of a
knot, leading to a closed formula in case of polygonal curves.

4
The categories of this paper are: cond-mat
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th
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The categories of this paper are: astro-ph
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The categories of this paper are: adap-org
1
The categories of this paper are: cs
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The categories of this paper are: quant-ph
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
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The categories of this paper are: solv-int
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The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-lat
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The categories of this paper are: patt-sol