2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/108904A mathematical interpretation of the usual definition of entropy (for a discrete probability distribution or a trace 1 positive operator) is given. This formulation makes some properties of entropy immediate.A note of 2 pages. The example at the end has been extendedGeneral MathematicsMathematical Physicstext