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math.FA2000
On the number of square integrable solutions and self-adjointness of symmetric first order systems of differential equations
Matthias Lesch, Mark M. Malamud
The main purpose of this paper is to investigate the formal deficiency indices of a symmetric first order system on an interval , wh…
math.DG2000
The eta-invariant, Maslov index, and spectral flow for Dirac-type operators on manifolds with boundary
Paul Kirk, Matthias Lesch
Several proofs have been published of the Mod Z gluing formula for the eta-invariant of a Dirac operator. However, so far the integer contribution to the gluing formula for the eta…
math.SP2000
Essential self-adjointness of symmetric linear relations associated to first order systems
Matthias Lesch
The purpose of this note is to present several criteria for essential self-adjointness. The method is based on ideas due to Shubin. This note is divided into two parts. The first p…