EntityQ3883909· pop 6· linked from 36 articlesoperator product expansionSign in to saveexpansion of the product of two local operators inserted close to each other as an asymptotic series with local-operator coefficientsConnectionsInternational Standard Book NumberEntityquantum field theoryEntityringEntityQ118398Entitycomplex planeEntityholomorphic functionEntityneighborhoodEntityLaurent seriesEntityoperatorEntityLie algebraEntityalgebra over a fieldEntityvector bundleEntitycommutatorEntityradius of convergenceEntitysecond quantizationEntityassociative algebraEntityconformal field theoryEntityscattering amplitudeEntityvertex operator algebraEntityStatistical field theoryEntityCategoriesAxiomatic quantum field theoryConformal field theoryQuantum field theoryString theory