Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topological volumes of fibrations: A note on open covers   We establish a straightforward estimate for the number of open sets with
fundamental group constraints needed to cover the total space of fibrations.
This leads to vanishing results for simplicial volume and minimal volume
entropy, e.g., for certain mapping tori.

29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg