Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Picard groups for blocks with normal defect groups and linear source
  bimodules   It is an open problem as to whether any bimodule inducing a Morita
auto-equivalence of a block must have endopermutation source. We prove that,
for blocks $b$ with normal defect groups in odd characteristic, a stronger
result holds, namely that all such bimodules have linear source. We also prove
the analogous result in characteristic $2$, provided that the defect group is
of a specific, slightly restrictive, form.

25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys
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The categories of this paper are: q-alg
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The categories of this paper are: solv-int