Abstract
We use the concept of generalized inverses to show that the extrema of the function \(G(x) = \|Ax-b\|^2\) are minima, A being a rectangular matrix not necessarily of full rank
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Phohomsiri, P. On the Extrema of Linear Least-Squares Problems. J Optim Theory Appl 127, 665–669 (2005). https://doi.org/10.1007/s10957-005-7509-6
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DOI: https://doi.org/10.1007/s10957-005-7509-6