  We review some analytic results on the deconfinement transition in pure
lattice gauge theories. In particular we discuss the relationship between the
deconfinement transition in the $(d+1)$-dimensional $SU(2)$ model and the
magnetization transition in the $d$-dimensional Ising model. This analysis
leads to a precise estimate of the deconfinement temperature which agrees well
with that obtained with a Montecarlo simulation in the case in which the
lattice has only one link in the compactified time direction.
