Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rigid isotopy classification of real degree-4 planar rational curves
  with only real nodes (An elementary approach)   We prove an elementary method to classify, up to rigid isotopy, all nodal
degree 4 real rational curves in $\mathbb{RP}^2$ that have only real double
points. We show how to associate a chord diagram to a nodal real degree 4
planar rational curve and prove that such curves are defined up to rigid
isotopy by their chord diagrams.

24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
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The categories of this paper are: solv-int