🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPortuguêsTürkçeРусский한국어中文日本語EntityQ850495· pop 9· linked from 84 articlesWick's theoremtheorem transforming derivatives into combinatorics problems applied in quantum field theoryAvailable in 8 languagesFrançaisDeutsch中文РусскийItalianoUkrainian한국어via Wikidata sitelinks · CC0Connectionsnormal orderEntityquantum mechanicsEntityCategoriesPhysics theoremsQuantum field theoryScattering theory