Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Factorial threefold hypersurfaces   Let $X$ be a hypersurface in $\mathbb{P}^{4}$ of degree $d$ that has at most
isolated ordinary double points. We prove that $X$ is factorial in the case
when $X$ has at most $(d-1)^{2}-1$ singular points.

26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg