In this paper we analyze the resolvent, the heat kernel and the spectral zeta function of the operator over the finite interval. The structural properties of these spectral functions depend strongly on the chosen self-adjoint realization of the operator, a choice being made necessary because of the singular potential present. Only for the Friedrichs realization standard properties are reproduced, for all other realizations highly nonstandard properties are observed. In particular, for we find terms like in the small- asymptotic expansion of the heat kernel. Furthermore, the zeta function has as a logarithmic branch point.
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