Chandrasekhar ansatz and the generalized total angular momentum operator for the Dirac equation in the Kerr-Newman metric.
Charakerisierung ?kompakter" hermitescher Operatoren.
Closed spectral measures in Fréchet spaces.
Closure of Similarity Orbits of Hubert Space Operators. III.
Commutation relations involving spectrally scattered operators
Commutativity of compact selfadjoint operators
The relationship between the joint spectrum γ(A) of an n-tuple of selfadjoint operators and the support of the corresponding Weyl calculus T(A) : f ↦ f(A) is discussed. It is shown that one always has γ(A) ⊂ supp (T(A)). Moreover, when the operators are compact, equality occurs if and only if the operators mutually commute. In the non-commuting case the equality fails badly: While γ(A) is countable, supp(T(A)) has to be an uncountable set. An example is given showing that, for non-compact operators,...
Commuting normal operators in partial -algebras
Compact Hermitian operators on projective tensor products of Banach algebras.
Composition operators on vector-valued Hardy spaces.
Continuite lipschitzienne du spectre comme fonction d'un opérateur normal
Continuous extensions of spectral measures
Convergence of generalized eigenfunction expansions.
Convexity, boundedness, and almost periodicity for differential equations in Hilbert space.
Correction to "Approximation with Restricted Spectra".
Cyclic space isomorphism of unitary operators
We introduce a new equivalence relation between unitary operators on separable Hilbert spaces and discuss a possibility to have in each equivalence class a measure-preserving transformation.