Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bulk-edge correspondence and the cobordism invariance of the index   We show that the bulk-edge correspondence for two-dimensional type A and type
AII topological insulators follows directly from the cobordism invariance of
the index.

0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th