Titlebook: Contributions to Operator Theory and its Applications; Proceedings of the C I. Gohberg,J. W. Helton,L. Rodman Conference proceedings 1988 B

防銹

偽造者

https://doi.org/10.1007/978-3-642-59702-2In this paper we derive an analogue for integral operators of the well-known heat expansion for the Laplacian or other operators of positive order. Previous work established a partial expansion of . 1 terms for a single integral operator in . dimensions. This is here extended to systems of operators.

LIEN

苦笑

小歌劇

Duality and Uniform Approximation by Solutions of Elliptic Equations,In this paper we study the uniform approximation of continuous functions on compact subsets of .. by solutions of second order elliptic equations. Also we discuss the problem of existence of a continuous best approximation and the connection of the approximation problem to some isoperimetric inequalities.

不在灌木叢中

Hamiltonian Representation of Stationary Processes,We show that any stationary m.s. continuous Gaussian process can be generated as the output of a Linear Hamiltonian System with a suitable invariant probability measure on the phase space.

先鋒派

On Lifting to the Commutant,It is shown that the lifting to the commutant problem in dilation theory is a particular case of the general dilation theorem for semigroups without involution. Applications are given to subnormal and contraction homomorphisms.

Acupressure

The Smooth Mappings Which Preserve the Hardy Space H2(Bn),Holomorphic self-maps . of the open unit ball in ?. which extend to be C. on the closed unit ball are considered. For such . we characterize those with the property that composition by . preserves the Hardy space H..

Embolic-Stroke

Random Toeplitz and Hankel Operators,An analogue of Hartman’s theorem on completely continuous Hankel operators is proved for Hankel operators with random symbols.

暴露他抗議

Nearly Invariant Subspaces of the Backward Shift,A theorem of D. Hitt describing certain subspaces of H. that miss by one dimension being invariant under the backward shift operator is given a new approach and extended.