Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On cardinality bounds for $\theta^n$-Urysohn spaces   We introduce the class of $\theta^{n}$-Urysohn spaces and the
$n$-$\theta$-closure operator. $\theta^n$-Urysohn spaces generalize the notion
of a Urysohn space. We estabilish bounds on the cardinality of these spaces and
cardinality bounds if the space is additionally homogeneous.

26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th