2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/157705We develop a mathematical approach to the nonequilibrium work theorem which is traditionally referred to in statistical mechanics as Jarzynski's identity. We suggest a mathematically rigorous formulation and proof of the identity.ProbabilityMathematical Physics60J25, 60J35, 82C05text