Bounds on antipodal spherical designs with few angles

Zhiqiang Xu, Zili Xu, Wei-Hsuan Yu

A finite subset $X$ on the unit sphere ${\mathbb{S}}^{d-1}$ is called an $s$-distance set with strength $t$ if its angle set $A(X):=\{\langle \mathbf{x},\mathbf{y}\rangle : \mathbf{x…