# On the growth of the resolvent operators for power bounded operators

Banach Center Publications (1997)

- Volume: 38, Issue: 1, page 247-264
- ISSN: 0137-6934

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topNevanlinna, Olavi. "On the growth of the resolvent operators for power bounded operators." Banach Center Publications 38.1 (1997): 247-264. <http://eudml.org/doc/208633>.

@article{Nevanlinna1997,

abstract = {Outline. In this paper I discuss some quantitative aspects related to power bounded operators T and to the decay of $T^\{n\}(T-1)$. For background I refer to two recent surveys J. Zemánek [1994], C. J. K. Batty [1994]. Here I try to complement these two surveys in two different directions. First, if the decay of $T^\{n\}(T-1)$ is as fast as O(1/n) then quite strong conclusions can be made. The situation can be thought of as a discrete version of analytic semigroups; I try to motivate this in Section 1 by demonstrating the similarity and lack of it between power boundedness of T and uniform boundedness of $e^\{t(cT-1)\}$ where c is a constant of modulus 1 and t > 0. Section 2 then contains the main result in this direction. I became interested in studying the quantitative aspects of the decay of $T^\{n\}(T-1)$ since it can be used as a simple model for what happens in the early phase of an iterative method (O. Nevanlinna [1993]). Secondly, the so called Kreiss matrix theorem relates bounds for the powers to bounds for the resolvent. The estimate is proportional to the dimension of the space and thus has as such no generalization to operators. However, qualitatively such a result holds in Banach spaces e.g. for Riesz operators: if the resolvent satisfies the resolvent condition, then the operator is power bounded operator (but without an estimate). I introduce in Section 3 a growth function for bounded operators. This allows one to obtain a result of the form: if the resolvent condition holds and if the growth function is finite at 1, then the powers are bounded and can be estimated. In Section 4 in addition to the Kreiss matrix theorem, two other applications of the growth function are given.},

author = {Nevanlinna, Olavi},

journal = {Banach Center Publications},

keywords = {power bounded operators on a Banach space; growth of the resolvent; growth functions of the resolvent; value distribution theory for analytic functions; semigroups of operators; iterative matrix methods},

language = {eng},

number = {1},

pages = {247-264},

title = {On the growth of the resolvent operators for power bounded operators},

url = {http://eudml.org/doc/208633},

volume = {38},

year = {1997},

}

TY - JOUR

AU - Nevanlinna, Olavi

TI - On the growth of the resolvent operators for power bounded operators

JO - Banach Center Publications

PY - 1997

VL - 38

IS - 1

SP - 247

EP - 264

AB - Outline. In this paper I discuss some quantitative aspects related to power bounded operators T and to the decay of $T^{n}(T-1)$. For background I refer to two recent surveys J. Zemánek [1994], C. J. K. Batty [1994]. Here I try to complement these two surveys in two different directions. First, if the decay of $T^{n}(T-1)$ is as fast as O(1/n) then quite strong conclusions can be made. The situation can be thought of as a discrete version of analytic semigroups; I try to motivate this in Section 1 by demonstrating the similarity and lack of it between power boundedness of T and uniform boundedness of $e^{t(cT-1)}$ where c is a constant of modulus 1 and t > 0. Section 2 then contains the main result in this direction. I became interested in studying the quantitative aspects of the decay of $T^{n}(T-1)$ since it can be used as a simple model for what happens in the early phase of an iterative method (O. Nevanlinna [1993]). Secondly, the so called Kreiss matrix theorem relates bounds for the powers to bounds for the resolvent. The estimate is proportional to the dimension of the space and thus has as such no generalization to operators. However, qualitatively such a result holds in Banach spaces e.g. for Riesz operators: if the resolvent satisfies the resolvent condition, then the operator is power bounded operator (but without an estimate). I introduce in Section 3 a growth function for bounded operators. This allows one to obtain a result of the form: if the resolvent condition holds and if the growth function is finite at 1, then the powers are bounded and can be estimated. In Section 4 in addition to the Kreiss matrix theorem, two other applications of the growth function are given.

LA - eng

KW - power bounded operators on a Banach space; growth of the resolvent; growth functions of the resolvent; value distribution theory for analytic functions; semigroups of operators; iterative matrix methods

UR - http://eudml.org/doc/208633

ER -

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