The ϕ34 model at finite temperature is simulated on the lattice. For
fixed Nt we compute the transition line for Ns→∞ by means of
Finite Size Scaling techniques. The crossings of a Renormalization Group
trajectory with the transition lines of increasing Nt give a well defined
limit for the critical temperature in the continuum. By considering different
RG trajectories, we compute Tc/g as a function of the renormalized
parameters.Comment: 26 pages, Latex, epsfig, 8 figures include