Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 4-manifolds and intersection forms with local coefficients   We extend Donaldson's diagonalization theorem to intersection forms with
certain local coefficients, under some constraints. This provides new examples
of non-smoothable topological 4-manifolds.

18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
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The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an