Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The prime divisors of the period and index of a Brauer class   We show that in locally-ringed connected topoi the primes dividing the period
and index of a Brauer class coincide. The result applies in particular to
Brauer classes on connected schemes, algebraic stacks, topological spaces and
to the projective representation theory of profinite groups.

14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
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The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
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The categories of this paper are: acc-phys