  Physical properties of plasmas such as equations of state and transport
coefficients are expressed in terms of correlation functions, which can be
calculated using various approaches (analytical theory, numerical simulations).
The method of Green's functions provides benchmark values for these properties
in the low-density limit. For the equation of state and electrical
conductivity, expansions with respect to density (virial expansions) are
considered. Comparison of analytical results with numerical simulations is used
to verify theory, to prove the accuracy of simulations, and to establish
interpolation formulas.
