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Proofs involving the Moore–Penrose pseudoinverse
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Proofs involving the Moore–Penrose pseudoinverse : ウィキペディア英語版
Proofs involving the Moore–Penrose pseudoinverse
(詳細はreal numbers or the field
\mathbb, of complex numbers. Then there is a unique ''n''-by-''m'' matrix A^+ over \mathbb, such that:
# ''A A+A = A''
# ''A+A A+ = A+''
# ''(AA+)
*
= AA+''
# ''(A+A)
*
= A+A''
''A+'' is called the Moore-Penrose pseudoinverse of ''A''. Notice that A is also the Moore-Penrose pseudoinverse of ''A+'' . That is, (''A+'' )''+'' = A.
==Useful lemmas==
These results are used in the proofs below.
In the following lemmas,
''A'' is a matrix with complex elements and ''n'' columns,
''B'' is a matrix with complex elements and ''n'' rows.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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