Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A simply connected numerical Godeaux surface with ample canonical class   We prove that a recent construction of a numerical Godeaux surface due to P.
Craighero and R. Gattazzo is simply connected, and show how to realize their
construction as a double plane. By proving that the surface contains no
(-2)-curves, we obtain that this is the first example of a simply connected
surface with vanishing geometric genus and ample canonical class.

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The categories of this paper are: quant-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: chem-ph
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-th
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: eess
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The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: patt-sol