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fix possible typo in book. #147

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fix possible typo in book. #147

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2 changes: 1 addition & 1 deletion _weave/lecture08/automatic_differentiation.jmd
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Expand Up @@ -496,7 +496,7 @@ For a function $f: \mathbb{R}^n \to \mathbb{R}$ the basic operation is the
$$\lim_{\epsilon \to 0} \frac{f(\mathbf{x} + \epsilon \mathbf{v}) - f(\mathbf{x})}{\epsilon} =
[\nabla f(\mathbf{x})] \cdot \mathbf{v},$$

where $\epsilon$ is still a single dimension and $\nabla f(\mathbf{x})$ is the
where $\epsilon$ is still a single dimension and $\mathbf{v}$ is the
direction in which we calculate.

We can directly do this using the same simple `Dual` numbers as above,
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