Yufei Zhao

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math.CO2024

Equiangular lines and eigenvalue multiplicities

Yufei Zhao

Expository article on the problem of determining the maximum number of equiangular lines with a fixed angle, and the associated problem of second eigenvalue multiplicity in graphs.

math.CO2023

Uniacute Spherical Codes

Saba Lepsveridze, Aleksandre Saatashvili, Yufei Zhao

A spherical $L$ -code, where $L \subseteq [- 1, \infty)$ , consists of unit vectors in $R^{d}$ whose pairwise inner products are contained in $L$ . Determining the maximum cardin…