Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Picard Rank of an Enriques Surface   In this note, we use crystalline methods and the Tate-conjecture to give a
short proof that the Picard rank of an Enriques surface is equal to its second
Betti number.

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The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
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The categories of this paper are: funct-an
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The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex