Several standard problems can be understood conceptually using two or three regions
with constant potentials.
We will find solutions in each region of the potential.
These potentials have **simple solutions to the Schrödinger equation**.
We must then match the solutions at the boundaries between the regions.
Because of the multiple regions,
these problems will require **more work with boundary conditions** than is usual.

**Subsections**

Jim Branson
2013-04-22