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
复制标题
最小二乘估计应用于不适定问题的不收敛结果
DOI:
10.1007/bf01686719
复制
发表时间:
1980
影响因子:
1.9
通讯作者:
T. Seidman
中科院分区:
文献类型:
--
作者:
T. Seidman
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.