Radiation conditions and resolvent estimates for relativistic Schrödinger operators
Regular Eigenvalue Problems with Eigenvalue Parameter in the Boundary Condition.
Regularity and Decay of Eigenfunctions.
Relatively tauberian resolvent operators.
Remarks on embeddable semigroups in groups and a generalization of some Cuthbert's results.
Remarks on relativistic Schrödinger operators and their extensions
Remarks on the spectrum of bounded and normal operators on Hilbert spaces.
Representations of Polish groups and continuity
In the first part of the paper, some criteria of continuity of representations of a Polish group in a Banach algebra are given. The second part uses the result of the first part to deduce automatic continuity results of Baire morphisms from Polish groups to locally compact groups or unitary groups. In the final part, the spectrum of an element in the range of a strongly but not norm continuous representation is described.
Reproduzierende Kerne, Fundamentalkerne und Resolventenkerne.
Resolvent and spectrum of a nonselfadjoint differential operator in a Hilbert space
We consider a second order regular differential operator whose coefficients are nonselfadjoint bounded operators acting in a Hilbert space. An estimate for the resolvent and a bound for the spectrum are established. An operator is said to be stable if its spectrum lies in the right half-plane. By the obtained bounds, stability and instability conditions are established.
Resolvent conditions and powers of operators
We discuss the relation between the growth of the resolvent near the unit circle and bounds for the powers of the operator. Resolvent conditions like those of Ritt and Kreiss are combined with growth conditions measuring the resolvent as a meromorphic function.
Resolvent estimates for scalar fields with electromagnetic perturbation.
Resolvent estimates for Schrödinger operators in L (R ) and the theory of exponentially bounded C-semigroups.
Resolvent kernel for the Kohn Laplacian on Heisenberg groups.
Resolvent Vectors, Invariant Subspaces, and Sets of Zero Capacity.
Resolventenkerne, Carleman-Operatoren in LP-Räumen und Hille-Tamarkin-Operatoren.