
doi: 10.1137/0713029
Let $Av = b$ be an overdetermined system of m complex equations in n unknowns with rank $(A) = k$ and $m \geqq 2k + 1$. It is shown that if $x_\infty $ is a Chebyshev solution of $Av = b$, then $x_\infty $ is also a Chebyshev solution of a $2k + 1 \times n$ subsystem of $Av = b,A_{2k + 1} v = b_{2k + 1} $. Furthermore, $\| {b - Ax_\infty } \|_\infty = \| {b_{2k + 1} - A_{2k + 1} x_\infty } \|_\infty $.Finally if $(\| \cdot \|_n )$ is a sequence of norms with the property that for each a in $C^n ,\| a \|_\infty \leqq \| a \|_n $ and $\lim _{n \to \infty } \| a \|_n = \| a \|_\infty $, it is shown that a sequence of best $\| \cdot \|_n $-approximate solutions of the overdetermined system of equations $Av = b$ converges to a best $\| \cdot \|_\infty $-approximate solution called the strict approximation.
Numerical solutions to overdetermined systems, pseudoinverses, Theory of matrix inversion and generalized inverses
Numerical solutions to overdetermined systems, pseudoinverses, Theory of matrix inversion and generalized inverses
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