🌐EnglishEnglishDeutschEspañolFrançaisItalianoPortuguêsРусскийالعربيةفارسیไทย한국어中文日本語EntityQ2597952· pop 20· linked from 161 articlesoperator in physicsfunction acting on the space of physical states in physicsAvailable in 20 languagesFrançais中文日本語РусскийPortuguêsItalianoالعربيةBanglaCatalanChuvashConnectionseigenvectors and eigenvaluesEntityspinEntityCategoriesOperator theoryTheoretical physics