Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Comparison of Distance Bounds for Quasi-Twisted Codes   Spectral bounds on the minimum distance of quasi-twisted codes over finite
fields are proposed, based on eigenvalues of polynomial matrices and the
corresponding eigenspaces. They generalize the Semenov-Trifonov and Zeh-Ling
bounds in a way similar to how the Roos and shift bounds extend the BCH and HT
bounds for cyclic codes. The eigencodes of a quasi-twisted code in the spectral
theory and the outer codes in its concatenated structure are related. A
comparison based on this relation verifies that the Jensen bound always
outperforms the spectral bound under special conditions, which yields a similar
relation between the Lally and the spectral bounds. The performances of the
Lally, Jensen and spectral bounds are presented in comparison with each other.

13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th