What means:(adsbygoogle = window.adsbygoogle || []).push({});

?

This guy, ##\vec{\nabla}_{\hat{\phi}} \hat{r}##, for example, means:

[tex]\\ \hat{\phi}\cdot\vec{\nabla}\hat{r} = \begin{bmatrix}

\phi _1 \\

\phi _2 \\

\end{bmatrix}

\begin{bmatrix}

\frac{\partial r_1}{\partial x} & \frac{\partial r_1}{\partial y} \\

\frac{\partial r_2}{\partial x} & \frac{\partial r_2}{\partial y} \\

\end{bmatrix}[/tex]

?

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# Derivatives of vectors

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