The Lemmens-Seidel conjecture and forbidden subgraphs

17 Mar 2020 Cao Meng-Yue H Jack Koolen Lin Yen-Chi Roger Yu Wei-Hsuan

In this paper we show that the conjecture of Lemmens and Seidel of 1973 for systems of equiangular lines with common angle $\arccos (1/5)$ is true. Our main tool is forbidden subgraphs for smallest Seidel eigenvalue $-5$...

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