Why didn't we define the derivative matrix on a grid through the familiar asymmetric derivative: [begin{equation*}frac{d f(x)}{d

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Why didn't we define the derivative matrix on a grid through the familiar "asymmetric" derivative:

\[\begin{equation*}\frac{d f(x)}{d x}=\lim _{\Delta x \rightarrow 0} \frac{f(x+\Delta x)-f(x)}{\Delta x} ? \tag{2.90}\end{equation*}\]

What are its eigenvalues? What happens when it is exponentiated?

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