Essential norms of weighted composition opera- tors on BMOA and the Bloch space

Cassels [Ca], bounding the maximum modulus of the conjugates of a non-reciprocal algebraic integer α, used the resul- tant of α and 1/α.. Then it follows easily that the required

We prove that if this operator maps a certain subset of the Banach space of functions of two real variables of boun- ded Wiener ϕ-variation into another Banach space of a similar

Boundary value problems for the p-Laplace operator subject to zero Dirichlet boundary conditions on a bounded domain have been studied extensively during the past two decades and

In general, the spectral mapping theorem for the Weyl spec- trum σ W (T ) does not hold (see [2], p.. Pearcy [7], the next proposition has already appeared in the preprint

Then taking into account the inverse operator theorem in C(∆) and Lemma 1.2, the problem of existence of continuous automorphisms in the commutant of l 1 and l 2 , is reduced to

The computation performed on the computer SUN/SPARC of the Insti- tute of Applied Mathematics and Mechanics of the University of Warsaw using the program GP/PARI has shown that no

The purpose of this paper is to develop the theory of Markov operators acting on the space M E of vector measures defined on Borel subsets of a compact metric space X.. These

In the case when X is an open interval and Y is a Banach space, it is well known under what conditions these extensions are continuous (cf.. Sablik brings theorems which answer