UNIFORM-CONVERGENCE OF ERGODIC LIMITS AND APPROXIMATE SOLUTIONS

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题名:	UNIFORM-CONVERGENCE OF ERGODIC LIMITS AND APPROXIMATE SOLUTIONS
作者:	SHAW,SY
贡献者:	數學研究所
关键词:	SEMIGROUPS;THEOREMS;EQUATIONS
日期:	1992
上传时间:	2010-06-29 19:41:31 (UTC+8)
出版者:	中央大學
摘要:	Let A be a densely defined closed (linear) operator, and {A(o)}, {B(alpha)} be two nets of bounded operators on a Banach space X such that parallel-to A(alpha) parallel-to = O(1), A(o)A subset-of AA(alpha), parallel-to AA(alpha) parallel-to = o(1), and B(o)A subset-of AB(o) = I - A(alpha). Denote the domain, range, and null space of an operator T by D(T), R(T), and N(T), respectively, and let P (resp. B) be the operator defined by Px = lim(alpha)A(alpha)x (resp. By = lim(alpha) B(alpha)y) for all those x epsilon X (resp. y epsilon R(A))BAR for which the limit exists. It is shown in a previous paper that D(P) = N(A) + R(A)BAR, R(P) = N(A), D(B) = A(D(A) intersection-of R(A))BAR, R(B) = D(A) intersection-of R(A)BAR, and that B sends each y epsilon D(B) to the unique solution of Ax = y in R(A)BAR. In this paper, we prove that D(P) = X and parallel-to A(alpha) - P paralle-to --> 0 if and only if parallel-to B(alpha)\D(B) - B parallel-to --> 0, if and only if parallel-to B(alpha)\D(B) parallel-to = O(1), if and only if R(A) is closed. Moreover, when X is a Grothendiock space with the Dunford-Pettis property, all these conditions are equivalent to the mere condition that D(P) = X. The general result is then used to deduce uniform ergodic theorems for n-times integrated semigroups, (Y)-semigroups, and cosine operator functions.
關聯:	PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY
显示于类别:	[數學研究所] 期刊論文

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