On the Jordan model operators
On the Krall-type polynomials.
On the Kreĭn-Langer integral representation of generalized Nevanlinna functions.
On the largest analytic set for cyclic operators.
On the largest generalized joint spectrum
On the lattice boundary of Markov operators
On the lattice properties of invariant functions for Markov operators on C(X)
On the Lax-Phillips scattering theory for transport equation
On the Leontief's problem in Banach lattices
On the Limit of Weighted Operator Averages.
On the local ergodic theorems of Krengel, Kubokawa, and Terrell
On the local spectral properties of weighted shift operators
We study the local spectral properties of both unilateral and bilateral weighted shift operators.
On the local spectral radius in partially ordered Banach spaces
On the Lyapunov equation in Banach spaces and applications to control problems.
On the mean ergodic theorem for Cesàro bounded operators
For a Cesàro bounded operator in a Hilbert space or a reflexive Banach space the mean ergodic theorem does not hold in general. We give an additional geometrical assumption which is sufficient to imply the validity of that theorem. Our result yields the mean ergodic theorem for positive Cesàro bounded operators in (1 < p < ∞). We do not use the tauberian theorem of Hardy and Littlewood, which was the main tool of previous authors. Some new examples, interesting for summability theory, are...
On the method of least squares of finding eigenvalues and eigenfunctions of some symmetric operators. II.
On the minimal space of surjectivity question for linear transformations on vector spaces with applications to surjectivity of differential operators on locally convex spaces.
On the minimax principle for -positive operators (Preliminary communication)
On the minimum time control problem and continuous families of convex sets
On the Moore-Penrose inverse in C*-algebras.
In this article, two results regarding the Moore-Penrose inverse in the frame of C*-algebras are considered. In first place, a characterization of the so-called reverse order law is given, which provides a solution of a problem posed by M. Mbekhta. On the other hand, Moore-Penrose hermitian elements, that is C*-algebra elements which coincide with their Moore-Penrose inverse, are introduced and studied. In fact, these elements will be fully characterized both in the Hilbert space and in the C*-algebra...