🌐EnglishEnglishDeutschFrançaisItalianoPortuguês한국어中文日本語EntityQ548536· pop 8· linked from 34 articlesnormal orderAlso known as Normal ordered producttype of operator ordering in quantum field theoryAvailable in 8 languagesFrançaisDeutsch中文日本語ItalianoUkrainian한국어via Wikidata sitelinks · CC0Connectionsfinite differenceEntitycommutatorEntityCategoriesQuantum field theory