Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A fractal version of the pinwheel tiling   We introduce a fractal version of the pinwheel substitution tiling. There are
thirteen basic prototiles, all of which have fractal boundaries. These tiles,
along with their reflections and rotations, create a tiling space which is
mutually locally derivable from the pinwheel tiling space. Interesting
rotational properties, symmetries, and relative tile frequency are discussed
for the tiling space associated with the fractal pinwheel tiling.

5
The categories of this paper are: gr-qc
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: nlin
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The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg