Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Examples of non-K\"{a}hler Calabi-Yau 3-folds with arbitrarily large
  $b_2$   We construct non-K\"{a}hler simply connected Calabi-Yau 3-folds with
arbitrarily large 2nd Betti numbers by smoothing normal crossing varieties with
trivial dualizing sheaves.

35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat