Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Calabi-Yau construction by smoothing normal crossing varieties   We investigate a method of construction of Calabi--Yau manifolds, that is, by
smoothing normal crossing varieties. We develop some theories for calculating
the Picard groups of the Calabi--Yau manifolds obtained in this method. Some
applications are included, such as construction of new examples of Calabi--Yau
3-folds with Picard number one with some interesting properties.

18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
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The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
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The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
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The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: gr-qc
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
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The categories of this paper are: q-alg