Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectral Bounds for Quasi-Twisted Codes   New lower bounds on the minimum distance of quasi-twisted codes over finite
fields are proposed. They are based on spectral analysis and eigenvalues of
polynomial matrices. They generalize the Semenov-Trifonov and Zeh-Ling bounds
in a manner similar to how the Roos and shift bounds extend the BCH and HT
bounds for cyclic codes.

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The categories of this paper are: nucl-th
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The categories of this paper are: physics
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The categories of this paper are: hep-lat
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: q-alg
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The categories of this paper are: cond-mat