Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rational Blowdowns of Smooth 4-Manifolds   In this paper we introduce a surgical procedure, called a rational blowdown,
for a smooth 4-manifold X and determine how this procedure affects both the
Donaldson and Seiberg-Witten invariants of X.

5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin