Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A note on fragmentability and weak-G_delta sets   In terms of fragmentability, we describe a new class of Banach spaces which
do not contain weak-G_delta open bounded subsets. In particular, none of these
spaces is isomorphic to a separable polyhedral space.

27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph