2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/228099We prove a law of large numbers and a central limit theorem for a tagged particle in a symmetric simple exclusion process in the one-dimensional lattice with variable diffusion coefficient. The scaling limits are obtained from a similar result for the current through -1/2 for a zero-range process with bond disorder. For the CLT, we prove convergence to a fractional Brownian motion of Hurst exponent 1/4.9 pagesStatistical MechanicsProbabilitytext