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The Lemmens-Seidel conjecture and forbidden subgraphs
Meng-Yue Cao, Jack H, Koolen, Yen-Chi Roger Lin, Wei-Hsuan Yu · 2020-03-17 · via math.CO updates on arXiv.org

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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