In one dimension there are at least three distinct solutions to the wave
equation that we are interested in. Two of these solutions *propagate* along the string - energy is *transported* from one
place to another by the wave. The third is a *stationary* solution,
in the sense that the wave doesn't propagate in one direction or the
other (not in the sense that the string doesn't move). But first:

- An Important Property of Waves: Superposition
- Arbitrary Waveforms Propagating to the Left or Right
- Harmonic Waveforms Propagating to the Left or Right
- Stationary Waves

Robert G. Brown 2004-04-12