Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A note on the parameterisation of Besicovitch sets   In response to a question raised (and answered in the negative) by Terry Tao
on his blog as to whether it is possible to rotate a line segment continuously
within a set of area zero, we show that there is a set of area zero in the
plane within which a line segment can be rotated by a Baire-1 map.

12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics