# Maxwell by hand

To really lean anything, one needs to practice over and over, by hand. Here is
a complete derivation of the Maxwell source equations using quaternions.
Instead of picking the familiar Cartesian coordinates of *t*, *x*, *y*, and *z*,
generalized coordinantes are used with the numbers 0-3.

Copy this over until you can do so without looking at a reference image. Leave your practice sheets around where you work or study. People will presume you are a genius.