Interdisciplinary Information Sciences
Online ISSN : 1347-6157
Print ISSN : 1340-9050
ISSN-L : 1340-9050
Spectral Proofs of Maximality of Some Seidel Matrices
Kiyoto YOSHINO
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JOURNAL FREE ACCESS Advance online publication

Article ID: 2021.S.01

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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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© 2021 by the Graduate School of Information Sciences (GSIS), Tohoku University
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