Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Absolute $\mathcal F$-Borel classes   We investigate and compare $\mathcal F$-Borel classes and absolute $\mathcal
F$-Borel classes. We provide precise examples distinguishing these two
hierarchies. We also show that for separable metrizable spaces, $\mathcal
F$-Borel classes are automatically absolute.

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The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga