The real equiangular tight frames obtained from rank 3 graphs
Eiichi Bannaĭ, Etsuko Bannai, Chin-Yen Lee, Hajime Tanaka, Wei-Hsuan Yu · Electronic Journal of Graph Theory and Applications · 2024
We present all nontrivial real equiangular tight frames { φ m } m =1 M in R N obtained as spherical embeddings of primitive rank 3 graphs on M vertices, and those such that one of their associated M strongly regular graphs on M - 1 vertices is a primitive rank 3 graph.