Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Almost split sequences for Knorr lattices   Let $O$ be a complete d.v.r. and $G$ a finite group. We give two applications
of an adjunction in the stable category of $OG$. The first application gives
necessary and sufficient conditions for the middle term of an almost split
sequence terminating in a Knorr lattice to be indecomposable.
  The second characterises the stable endomorphism rings of Heller lattices of
kG-modules.

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The categories of this paper are: hep-th
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
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The categories of this paper are: econ
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The categories of this paper are: hep-lat
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The categories of this paper are: stat
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The categories of this paper are: cond-mat
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The categories of this paper are: ao-sci
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The categories of this paper are: cs
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The categories of this paper are: cmp-lg