Universality of Deconfining Phase Transition in Finite-Temperature Lattice Gauge Theories

By our making use of the Monte Carlo renormalization-group method, it is shown that the deconfining phase transition of the (2+1)-dimensional $Z\left(2\right)\mathrm{}$ lattice gauge theory at finite temperature is governed by the same fixed point and critical indices as the two-dimensional Ising model, thus proving that both theories belong to the same universality class.