From the catalogue:

Complex functions and integration, line and surface integrals,
Fourier series, partial differential equations.

## Joukovski map

This is the conformal map:
\[ J(z)=z+\frac{1}{z} \]
Shown is the mapping the circle $|z-a|=|1-a|$ (blue) to an airfoil (red). The number $a$ (the center)
varies over an interval in the complex domain.

## D'Alembert's Solution of the Wave Equation with Maxima

### String plucked in the middle

### String plucked at 20% of the string length