2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/151869We explore a new definition of the persistence exponent, measuring the probability that a spin never flips after a quench of an Ising-like model at a temperature 0<T<Tc, while the usual definition only makes sense at T=0. This probability is now defined for spin blocks, and a general scaling for it, involving time and block linear size is introduced and illustrated by extensive simulations.Revtex, 10 pages (multicol.sty), 4 eps figures (uses epsfig), submitted to J. Phys. AStatistical Mechanicstext