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Banach空间中不适定线性算子方程的最佳逼近解
The Best Approximation Solution of Ill-posed Linear Operator Equation in Banach Space
【摘要】 设X,Y为Banach空间,T为从X到Y的线性算子.T的值域R(T)≠Y且为逼近紧子空间,T的零空间N(T)≠{θ}.证得不适定算子方程Tx=y的最佳逼近解对任意y∈Y均存在的充分必要条件是N(T)为X的迫近子空间.
【Abstract】 Let X,Y be Banach space,T be linear operator from X to Y.The range of T,R(T)≠Y and R(T) is approximation compact sub-space.The null space of T,N(T)≠{θ}.We prove that the best approximation solution of ill-posed operator equation Tx=y exists for every y∈Y if and only if N(T) is approximation sub-space of X.
【关键词】 Banach空间;
不适定线性算子方程;
逼近紧;
迫近性;
最佳逼近紧;
【Key words】 Banach space; ill-posed linear operator equation; approximation compact; approximation; the best approximation compact;
【Key words】 Banach space; ill-posed linear operator equation; approximation compact; approximation; the best approximation compact;
【基金】 哈尔滨学院学科基金(Hxk200715);国家自然科学基金(10671049);黑龙江教育厅科学技术基金(11531248)
- 【文献出处】 数学的实践与认识 ,Mathematics in Practice and Theory , 编辑部邮箱 ,2008年12期
- 【分类号】O177.2
- 【被引频次】3
- 【下载频次】87