Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Index and secondary index theory for flat bundles with duality   We discuss some aspects of index and secondary index theory for flat bundles
with duality. This theory was first developed by J. Lott. Our main purpose in
the present paper is to provide a modification with better functorial
properties.

19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ