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Self-orthogonal codes from orbit matrices of Seidel and Laplacian matrices of strongly regular graphs
<p style='text-indent:20px;'>In this paper we introduce the notion of orbit matrices of integer matrices such as Seidel and Laplacian matrices of some strongly regular graphs with respect to their permutation automorphism groups. We further show that under certain conditions these orbit matrices yield self-orthogonal codes over finite fields <inline-formula><tex-math id="M1">\begin{document}$ …