  We compute the free energy density for pure non-Abelian gauge theory at high
temperature and zero chemical potential. The three-loop result to $O(g^4)$ is
  [a lovely formula. Get the paper and print it out.] We examine the
sensitivity of this result to the choice of renormalization scale. We also give
a result for the free energy of scalar $\phi^4$ theory, correcting a result
previously given in the literature.
