On the Continuity of the Generalized Inverse

On the Continuity of the Generalized Inverse
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DOI:
10.1137/0117004
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发表时间:
1969
影响因子:
1.9
通讯作者:
G. Stewart
G. Stewart
中科院分区:
数学4区
文献类型:
--
作者:
G. Stewart

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(1.7)和(1.8)lim E,0,(1.9)lim(A+ E,)* At的充分条件是,对于所有充分大的n,E,的行和列位于A的行和列空间中。他还给出了与(1.5)式十分类似的扰动界。本文的目的是证明在(1.7)和(1.8)下,(1.9)成立的一个充要条件是,对所有充分大的n,rank(A+ E),rank(A)。
(1.7) and (1.8) lim E, 0, a sufficient condition that (1.9) lim (A+ E,)* At is that, for all sufficiently large n, the rows and columns of E, lie in the row and column spaces of A. He also gives a perturbation bound quite analogous to (1.5). The object of this paper isto show that under (1.7) and (1.8) a necessary and sufficient conditionfor (1.9) is that, for all sufficiently large n, rank (A+ E,) rank (A).