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If $X$ is an appropriate inverse of the nonsingular matrix $A\in \mathbb C^{n\times n}$ then two different measures of the quality of $X$ are $\|AX - I\|$ and $\|XA - I\|$. What is the largest factor by which these two quantities can differ ?

Thanks

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    "appropriate inverse"? Do you mean, "approximate inverse"?2012-11-19
  • 0
    Yes my mistace approximate inverse sorry2012-11-21

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