Acotabilidad de la función resolvente local.
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”
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...
Adjoining inverses to noncommutative Banach algebras and extensions of operators
Adjoint domains and generalized splines
Adjungiertenbildungen in der Operatortheorie.
Alcune osservazioni sul rango numerico per operatori non lineari
We discuss some numerical ranges for Lipschitz continuous nonlinear operators and their relations to spectral sets. In particular, we show that the spectrum defined by Kachurovskij (1969) for Lipschitz continuous operators is contained in the so-called polynomial hull of the numerical range introduced by Rhodius (1984).
Algebraic analysis in structures with the Kaplansky-Jacobson property
In 1950 N. Jacobson proved that if u is an element of a ring with unit such that u has more than one right inverse, then it has infinitely many right inverses. He also mentioned that I. Kaplansky proved this in another way. Recently, K. P. Shum and Y. Q. Gao gave a new (non-constructive) proof of the Kaplansky-Jacobson theorem for monoids admitting a ring structure. We generalize that theorem to monoids without any ring structure and we show the consequences of the generalized Kaplansky-Jacobson...
Algebraic and topological selections of multi-valued linear relations
Algebraic operators and moments on algebraic sets.
Algebraic polynomially bounded operators
Algebraic spectral subspaces
Algebraic spectral subspaces and automatic continuity
Algebraic theory of Atkinson operators
Algebraic theory of right invertible operators
Algebras of singular integral operators on rearrangement-invariant spaces and Nikolski ideals.
Algunos resultados sobre representabilidad finita de 1q (O < q ≤∞) en espacios p-Banach.