Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The cohomological index of free $\Z/p$-actions is not additive with
  respect to join   Let $p$ denote an odd prime. We show by example that the inequalities
obtained in arXiv:1704.05827 for the behaviour of the cohomological index of a
join of free $\Z/p$-actions are sharp. Namely, for all odd integers $k,l$ at
least one of which is greater than one, we give examples of finite free
$\Z/p$-CW complexes of cohomological indices $k$ and $l$ whose join has index
$k+l+1$ and also examples where the join has index $k+l-1$.

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The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
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The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
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The categories of this paper are: nlin
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The categories of this paper are: q-bio
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The categories of this paper are: quant-ph