Acotación y sumabilidad en ideales de operadores compactos en espacios de Hilbert.
Adaptive wavelet methods for saddle point problems
Adaptive wavelet methods for saddle point problems
Recently, adaptive wavelet strategies for symmetric, positive definite operators have been introduced that were proven to converge. This paper is devoted to the generalization to saddle point problems which are also symmetric, but indefinite. Firstly, we investigate a posteriori error estimates and generalize the known adaptive wavelet strategy to saddle point problems. The convergence of this strategy for elliptic operators essentially relies on the positive definite character of the operator....
Addendum “Complex transformation method and resonances in one-body quantum systems”
Addendum to "On product formulas for exponential functions".
Addendum to "On Some Space of Vector Valued Sequences".
Addendum to the paper: “Some fixed point theorems for multivalued mappings”
Additive and superadditive local theorems
Additive combinations of special operators
This is a survey paper on additive combinations of certain special-type operators on a Hilbert space. We consider (finite) linear combinations, sums, convex combinations and/or averages of operators from the classes of diagonal operators, unitary operators, isometries, projections, symmetries, idempotents, square-zero operators, nilpotent operators, quasinilpotent operators, involutions, commutators, self-commutators, norm-attaining operators, numerical-radius-attaining operators, irreducible operators...
Additivity of maps on triangular algebras.
Addresses
Adjoining inverses to noncommutative Banach algebras and extensions of operators
Adjoint and self-adjoint differential operators on graphs.
Adjoint bi-continuous semigroups and semigroups on the space of measures
For a given bi-continuous semigroup on a Banach space we define its adjoint on an appropriate closed subspace of the norm dual . Under some abstract conditions this adjoint semigroup is again bi-continuous with respect to the weak topology . We give the following application: For a Polish space we consider operator semigroups on the space of bounded, continuous functions (endowed with the compact-open topology) and on the space of bounded Baire measures (endowed with the weak-topology)....
Adjoint characterisations of unbounded weakly compact, weakly completely continuous and unconditionally converging operators
Characterisations are obtained for the following classes of unbounded linear operators between normed spaces: weakly compact, weakly completely continuous, and unconditionally converging operators. Examples of closed unbounded operators belonging to these classes are exhibited. A sufficient condition is obtained for the weak compactness of T' to imply that of T.
Adjoint domains and generalized splines
Adjointability of operators on Hilbert -modules.
Adjoints of composition operators on standard Bergman and Dirichlet spaces on the unit disk.
Adjoints of elliptic boundary value problems
Adjoints of solution semigroups and identifiability of delay differential equations in Hilbert spaces.