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Update 2017-02-13.tex #5

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2 changes: 1 addition & 1 deletion lec/2017-02-13.tex
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Expand Up @@ -152,7 +152,7 @@ \section{Residuals revisited}
other than Gaussian elimination? Will we have to completely redo our
error analysis? If we know $A$ and $b$, a reasonable way to evaluate
an approximate solution $\hat{x}$ independent of how we got it is
through the residual $r = b-A\hat{x}$. The approximate solution
through the residual $r = A\hat{x}-b$. The approximate solution
satisfies
\[
A \hat{x} = b + r,
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