🌐فارسیEnglishDeutschFrançaisItalianoPolskiРусскийفارسی한국어中文日本語EntityQ903835· pop 13· linked from 65 articlesعملگر مکانoperator in quantum mechanicsAvailable in 13 languagesFrançaisDeutsch中文日本語РусскийItalianoCatalanHebrewPolskiUkrainianConnectionsspinEntityDirac delta functionEntityCategoriesQuantum operators