Titlebook: Spectral Theory in Inner Product Spaces and Applications; 6th Workshop on Oper Jussi Behrndt,Karl-Heinz Förster,Carsten Trunk Conference pr

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Friedrich Philipp,Carsten Trunkrs. Crop rotation, soil reclamation, forestry, forage mixed cropping, intercropping with grasses and legumes, associative nitrogen fixation with non-legume crop978-94-017-3869-9978-0-306-47615-0Series ISSN 0924-1949

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On the Structure of Semigroups of Operators Acting in Spaces with Indefinite Metric,indefinite properties the generating plus-operator of a semigroup and all its positive integer powers can have only simultaneously and what indefinite properties they have not necessarily simultaneously. In conclusion, we consider several applications to dynamical systems with continuous and discrete time.

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Approximation of ,,-functions I: Models and Regularization,resentation which need not be irreducible. The state space in each of these models is a reproducing kernel Pontryagin space whose reproducing kernel is a matrix function constructed from the data in the representation.

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,Two-sided Weighted Shifts Are ‘Almost Krein’ Normal,lution of the commutation relation of the .-oscillator, which appears in the most innocent case of 0 < . < 1. A more prosaic motivation is as follows: the two-sided shift is unitary, hence normal; what kind of normality may be attributed to a two-sided . shift?

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On Domains of Powers of Linear Operators and Finite Rank Perturbations,dimension of dom . in dom . is obtained. An immediate consequence is that for any polynomial . the operator . is a finite-dimensional restriction of the operator . whenever . is a finite-dimensional restriction of .. The general results are applied to a perturbation problem of self-adjoint definitiz

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