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**Systems:**-
- Consist of many () particles (atoms or molecules)
- We know
*something*about their interactions

**Classical Mechanics:**- I know forces and initial conditions. I
want to predict the evolution. (
*F*=*ma*) **Quantum Mechanics:**- The problem is the same, but stated
differently: I want to know the evolution of
*wave function*. ()

Problems with classical and quantum mechanics:

- 1.
- Need to know initial conditions
*exactly*(Bradbury's butterfly) - 2.
- Classical mechanics can
*not*solve three body problem exactly^{}--even more difficult with more particles!

Is the problem of Statistical Thermodynamics hopeless? *NO!*

© 1997

Wed Sep 3 22:38:51 EDT 1997