Nonconvergence results for the application of least-squares estimation to Ill-posed problems

Nonconvergence results for the application of least-squares estimation to Ill-posed problems
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最小二乘估计应用于不适定问题的不收敛结果

DOI:
10.1007/bf01686719
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发表时间:
1980
影响因子:
1.9
通讯作者:
T. Seidman
T. Seidman
中科院分区:
数学3区
文献类型:
--
作者:
T. Seidman

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求解f(x)=B的一种标准方法是在x上最小化f(x)− B 2, \mathop \mathfrak{X}\limits^ \sim $$ 得双曲余切值. \mathop \mathfrak{X}\limits^ \sim $$ 对应于提供对真解x * 的足够好的近似的参数表示。2.求最小值x =A( \mathop \mathfrak{X}\limits^ \sim $$ ).采取 \mathop \mathfrak{X}\limits^ \sim $$ = $$\mathfrak{X}$$ N为一个序列{ $$\mathfrak{X}$$ N}的子空间变得稠密,因此确定一个近似序列{xN <$A( $$\mathfrak{X}$$ N)}。它表明,f线性和一对一,一个不需要有vexN →x* 当且仅当−1是不连续的。
AbstractOne standard approach to solvingf(x)=b is the minimization of ∥f(x)−b∥2 overx in $$\mathop \mathfrak{X}\limits^ \sim $$ , where $$\mathop \mathfrak{X}\limits^ \sim $$ corresponds to a parametric representation providing sufficiently good approximation to the true solutionx*. Call the minimizerx=A( $$\mathop \mathfrak{X}\limits^ \sim $$ ). Take $$\mathop \mathfrak{X}\limits^ \sim $$ = $$\mathfrak{X}$$ N for a sequence { $$\mathfrak{X}$$ N} of subspaces becoming dense, and so determine an approximating sequences {xN≔A ( $$\mathfrak{X}$$ N)}. It is shown, withf linear and one-to-one, that one need not havexN→x* iff−1 is not continuous.