🌐EnglishEnglishFrançaisItalianoTürkçeРусский한국어日本語EntityQ3748130· pop 6· linked from 16 articlesKeldysh formalismAlso known as Schwinger–Keldysh formalismgeneral framework for describing the quantum mechanical evolution of a system in a non-equilibrium stateAvailable in 6 languagesFrançais日本語РусскийItalianoTürkçevia Wikidata sitelinks · CC0Connectionspath-orderingEntityphase changeEntityCategoriesCondensed matter physicsElectromagnetismPhysics articles needing expert attention