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math-ph2005
Krein's Formula And Heat-Kernel Expansion For Some Differential Operators With A Regular Singularity
H. Falomir, P. A. G. Pisani
We get a generalization of Krein's formula -which relates the resolvents of different selfadjoint extensions of a differential operator with regular coefficients- to the non-regula…
math-ph2003
Unusual poles of the -functions for some regular singular differential operators
H. Falomir, M. A. Muschietti, P. A. G. Pisani +1
We consider the resolvent of a system of first order differential operators with a regular singularity, admitting a family of self-adjoint extensions. We find that the asymptotic e…