The Point Spectrum of Smooth Noncompact Hyperbolic Surfaces with Finite Area

Abstract

We construct a sequence of boundary value problems on compact subsets of smooth noncompact hyperbolic surfaces of finite area. We prove that the sesquilinear forms associated to these boundary value problems are stable as well as consistent at continuous functions which vanish at cusps. We also give an explicit form for the symbol expansion of the Dirichlet-to-Neumann operator of a certain Schrodinger operator. The symbols appearing in the expansion of this Dirichlet-to-Neumann operator can be calculated quickly by a computer using the formulas we provide in this paper.