ON RATIONAL APPROXIMATIONS OF SEMIGROUPS

ON RATIONAL APPROXIMATIONS OF SEMIGROUPS
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半群的有理逼近

DOI:
10.1137/0716051
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发表时间:
1979
影响因子:
2.9
通讯作者:
V. Thomée
V. Thomée
中科院分区:
数学2区
文献类型:
--
作者:
P. Brenner;V. Thomée

文献摘要

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本文证明了:如果$r^n(hA),nh = t$,是Banach空间上强连续半群$e^{tA} $的A-可接受有理逼近,则对t有界,$r^n(hA)} \| \leqq Cn^{{1/2}} $,在r的附加假设下有一定的改进.在对r和v的各种假设下,我们还讨论了$r^n(hA)v$到$e^{tA} v $的收敛性。
We show that if $r^n (hA),nh = t$, is an A-acceptable rational approximation of a strongly continuous semigroup $e^{tA} $ on a Banach space, then for t bounded, $\| {r^n (hA)} \| \leqq Cn^{{1/2}} $, with certain improvements under additional hypotheses on r. We also discuss the convergence of $r^n (hA)v$ to $e^{tA} v$ as $h \to 0$ under various assumptions on r and v.