Distances between elements of a semigroup and estimates for derivatives

Distances between elements of a semigroup and estimates for derivatives
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半群元素之间的距离和导数的估计

DOI:
10.1007/s10114-010-8569-6
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发表时间:
2010
期刊:
Acta Mathematica Sinica, English Series
影响因子:
--
通讯作者:
Bendouad Z
Bendouad Z
中科院分区:
--
文献类型:
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作者:
Bendouad Z

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本文首先讨论了差分est (t)-T(s)在原点附近的行为,其中(t (t))是Banach空间上的算子半群,定义在正实直线上或右半平面上的扇形上(在这种情况下假定它是解析的)。对于非拟无效的情况,给出了已发表文献结果的推广,并给出了最佳可能常数;对于半平面上的拟幂半群,一般情况下,像asT(t)-T(2t)这样的差在原点附近有接近2的范数。所给出的技术使人们能够推导出半群的产生子的其他函数的估计;特别地,给出了在原点附近导数的条件,以保证该半群生成一元代数并具有有界生成子。
This paper is concerned first with the behaviour of differencesT(t)-T(s) near the origin, where (T(t)) is a semigroup of operators on a Banach space, defined either on the positive real line or a sector in the right half-plane (in which case it is assumed analytic). For the non-quasinilpotent case extensions of results in the published literature are provided, with best possible constants; in the case of quasinilpotent semigroups on the half-plane, it is shown that, in general, differences such asT(t)-T(2t) have norm approaching 2 near the origin. The techniques given enable one to derive estimates of other functions of the generator of the semigroup; in particular, conditions are given on the derivatives near the origin to guarantee that the semigroup generates a unital algebra and has bounded generator.
DOI: --
发表时间: 2007
期刊:
影响因子: --
作者:
Z. Bendaoud;J. Esterle;A. Mokhtari
通讯作者: A. Mokhtari
DOI: --
发表时间: 2005
期刊:
影响因子: --
作者:
J. Esterle
通讯作者: J. Esterle
解析半群的边界值和相关的范数估计
DOI: --
发表时间: 2010
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作者:
I. Chalendar;J. Esterle;J. Partington
通讯作者: J. Partington
DOI: --
发表时间: 1970
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作者:
A. Beurling
通讯作者: A. Beurling