Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Real-analytic, volume-preserving actions of lattices on 4-manifolds   We prove that any real-analytic, volume-preserving action of a lattice
$\Gamma$ in a simple Lie group with $\Qrank(\Gamma)\geq 7$ on a closed
4-manifold of nonzero Euler characteristic factors through a finite group
action.

15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga