An n×m matrix A^- is a 1-inverse of an m×n matrix A for which A A^- A = A. The Moore-Penrose matrix inverse is a particular type of 1-inverse. A matrix equation A x = b has a solution iff A A^- b = b (Campbell and Meyer 1991).
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Jonathan is doing really well in all of his classes this semester, 5 A’s & 2 B’s (he has a computer essentials class instead of PLC). In his Algebra class that Nathan is helping him with he has an A+.
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