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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 , of complex numbers. Then there is a unique ''n''-by-''m'' matrix over , 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.
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