Robertson-type Theorems for Countable Groups of Unitary Operators

David R. Larson, Wai Shing Tang, Eric Weber

Let $\mathcal{G}$ be a countably infinite group of unitary operators on a complex separable Hilbert space $H$. Let $X=\{x_1,...,x_r\}$ and $Y=\{y_1,...,y_s\}$ be finite…