Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: T-duality simplifies bulk-boundary correspondence: some higher
  dimensional cases   Recently we introduced T-duality in the study of topological insulators, and
used it to show that T-duality trivialises the bulk-boundary correspondence in
2 dimensions. In this paper, we partially generalise these results to higher
dimensions and briefly discuss the 4D quantum Hall effect.

20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin