2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/87030The questions of justification of the Gibbs canonical distribution for systems with elastic impacts are discussed. A special attention is paid to the description of probability measures with densities depending on the system energy.14 pages, 1 figureClassical PhysicsBilliards, Invariant Measures, and Equilibrium Thermodynamicstext