Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exotic smooth structures on (2n+2l-1)CP^2#(2n+4l-1)(-CP^2)   As an application of `reverse engineering' technique introduced by R.
Fintushel, D. Park and R. Stern \cite{FPS}, we construct an infinite family of
fake (2n+2l-1)CP^2#(2n+4l-1)(-CP^2)'s for all n \ge 0, l \ge 1.

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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: adap-org
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The categories of this paper are: cond-mat
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The categories of this paper are: gr-qc
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ex
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The categories of this paper are: econ
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The categories of this paper are: chem-ph
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The categories of this paper are: cs
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an