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2. Exact Expressions for
![${\rm\cal {F}}_{ex}[\rho ]$](img1.gif)
Functional integration (see 2.1) leads to exact formulae
for the excess free energy.
Generally, these expressions are useful only after some further
simplification. There is one case, the ``Tonks gas'' in an external field,
that may treated without additional assumptions (see 2.2).
Subsections
Franz J. Vesely Oct 2001
See also: "Computational Physics - An Introduction," Kluwer-Plenum 2001