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:
影响因子:
--
通讯作者:
Bendouad Z
中科院分区:
文献类型:
--
作者:
Bendouad Z
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.
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DOI:
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发表时间:
2007
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作者:
Z. Bendaoud;J. Esterle;A. Mokhtari
通讯作者:
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DOI:
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发表时间:
2005
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影响因子:
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作者:
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J. Esterle
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发表时间:
2010
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影响因子:
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作者:
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通讯作者:
J. Partington
DOI:
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发表时间:
1970
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影响因子:
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作者:
A. Beurling
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A. Beurling