On local ergodic theorems for positive semigroups
On Markovian cocycle perturbations in classical and quantum probability.
On maximal compact subsemigroups of the endomorphism semigroup of an n-dimensional complex vector space.
On operator bands
A multiplicative semigroup of idempotent operators is called an operator band. We prove that for each K>1 there exists an irreducible operator band on the Hilbert space which is norm-bounded by K. This implies that there exists an irreducible operator band on a Banach space such that each member has operator norm equal to 1. Given a positive integer r, we introduce a notion of weak r-transitivity of a set of bounded operators on a Banach space. We construct an operator band on that is weakly...
On Operators with Bounded Imaginary Powers in Banach Spaces.
On operator-valued cosine sequences on UMD spaces
A two-sided sequence with values in a complex unital Banach algebra is a cosine sequence if it satisfies for any n,m ∈ ℤ with c₀ equal to the unity of the algebra. A cosine sequence is bounded if . A (bounded) group decomposition for a cosine sequence is a representation of c as for every n ∈ ℤ, where b is an invertible element of the algebra (satisfying , respectively). It is known that every bounded cosine sequence possesses a universally defined group decomposition, the so-called...
On perturbation theory for exponentially bounded C-semigroups.
On product formulas for exponential functions.
On random evolutions induced by countable state space Markov chains
On reducibility of some operator semigroups and algebras on locally convex spaces.
On relations between additive and multiplacative clustering operators
On relatively bounded perturbations of linear -semigroups
On resolvent positive operators and positive C0-semigroups on AL-spaces.
On scalar type spectral operators, infinite differentiable and Gevrey ultradifferentiable -semigroups.
On semigroups generated by left-invariant positive differential operators on nilpotent Lie groups
On some Schrödinger operators with a singular complex potential
On the abstract Cauchy problem in the case of constant domains
Si studiano esistenza, unicità e regolarità delle soluzioni strette, classiche e forti dell'equazione di evoluzione non autonoma con il dato iniziale , in uno spazio di Banach . Gli operatori sono generatori infinitesimali di semi-gruppi analitici ed hanno dominio indipendente da e non necessariamente denso in . Si danno condizioni necessarie e sufficienti per l'esistenza e la regolarità hölderiana della soluzione e della sua derivata.
On the boundary spectrum of dominated Co-semigroups.
On the bounded cosine operator function in Banach space
On the Closedness of the Sum of Two Closed Operators.