Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chromatic properties of generic planar configurations of points   We study the Orchard relation for generic configurations of points in the
plane (also called order types). We introduce infinitesimally-close points and
analyse the relation of this notion with the Orchard relation.
  The second part of the paper deals with monochromatic configurations (for the
Orchard relation). We give the complete list of all monochromatic
configurations up to 7 points and present some constructions and families of
monochromatic configurations.

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The categories of this paper are: supr-con
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The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
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The categories of this paper are: funct-an
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The categories of this paper are: stat
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The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: eess