2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/22817We provide a unifying axiomatics for Renyi's entropy and non-extensive entropy of Tsallis. It is shown that the resulting entropy coincides with Csiszar's measure of directed divergence known from communication theory.Presented at Next2003, uses Elsevier LaTeX macrosStatistical MechanicsHigh Energy Physics - TheoryMathematical PhysicsQuantum Physicstext