We defined the hyperbolic functions of a complex variable and proved a variety of
their properties. We then discussed inverse functions in general, then specifically
the inverse function of e^z, first as a multivalued function log(z), then a specific
`branch' called Log(z), and then a general way to define branches from log(z).
We derived the derivatives of these branches; they are all 1/z.

HW: section 31, 32, 35