2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/26129The basic notions related to coherence phenomena are formulated. Two types of coherence are described, state coherence and transition coherence. Useful characteristics for quantifying coherence are defined, such as coherence functions, coherence radius, coherence length, and coherence time.Latex file, 6 pagesStatistical MechanicsAtomic Physicstext