At Most Two Radii Theorem For A Real Eigenvalue Of The Hyperbolic Laplacian

Sergei Artamoshin

We study a $(k+1)$-dimensional hyperbolic space of a negative constant sectional curvature $\kappa =-1/{\rho }^2$. Let $\lambda$ be a real eigenvalue and $f_{\lambda }(x)$ be an eigenfunction of the hyperbo…