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** Contents**

The problems discussed in the previous section (harmonic oscillator, rigid
rotator, etc.) are some of the few quantum mechanics problems which can be
solved analytically. For the vast majority of chemical applications,
the Schrödinger equation must be solved by approximate methods.
The two primary approximation techniques are the variational method and
perturbation theory.

**Subsections**

David Sherrill
2006-08-15