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Spectrum of the Laplace-Beltrami operator on a domain of finite volume in the hyperbolic space $H^n$
What is known about the ($L^2$) spectrum of the minus Laplace-Beltrami operator ($- \Delta$) with zero boundary conditions on $B =H^n/\Gamma$, where $H^n$ is $n$-dimensional hyperbolic space ($n>1$...
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