Interdisciplinary Information Sciences
Online ISSN : 1347-6157
Print ISSN : 1340-9050
ISSN-L : 1340-9050
Short Communication
Spectral Proofs of Maximality of Some Seidel Matrices
Kiyoto YOSHINO
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Keywords: Seidel matrix, equiangular lines, maximality of Seidel matrices, Seidel spectrum
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2022 Volume 28 Issue 1 Pages 107-110

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Abstract

Lin and Yu verified maximality of some Seidel matrices in 2020 by calculating clique numbers with a computer. In this paper, we show that maximality of these matrices follows by investigating their spectra, without using a computer.

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© 2022 by the Graduate School of Information Sciences (GSIS), Tohoku University

This article is licensed under a Creative Commons [Attribution 4.0 International] license.
https://creativecommons.org/licenses/by/4.0/
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