Bestimmung und Anwendung von Vekua-Resolventen.
Blow-up for solutions of hyperbolic PDE and spacetime singularities
An important question in mathematical relativity theory is that of the nature of spacetime singularities. The equations of general relativity, the Einstein equations, are essentially hyperbolic in nature and the study of spacetime singularities is naturally related to blow-up phenomena for nonlinear hyperbolic systems. These connections are explained and recent progress in applying the theory of hyperbolic equations in this field is presented. A direction which has turned out to be fruitful is that...
Boundary value problem for Fuchsian partial differential equations and reflection of singularities
Boundary value problems for generalized analytic functions of several complex variables
Boundary-Variation Solution of Eigenvalue Problems for Elliptic Operators.