Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An infinite order cork   We construct an infinite order cork (W,f), which means that W is a smooth
compact contractible 4-manifold with Stein structure, and f is a self
diffeomorphism of the boundary of W, such that the n-fold composition maps
f^{n}=f o f o... o f give rise to smoothly distinct corks (W, f^{n}) for
sufficiently large values of n, as it approaches to infinity.

7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph