EntityQ2496679· pop 9· linked from 108 articlescorrelation functionSign in to savematrix element computed by inserting a product of operators between two states in quantum field theoryConnectionspath integralEntityvacuum stateEntitypath-orderingEntityphysicsEntityquantum mechanicsEntityInternational Standard Book NumberEntitygeneral relativityEntityspecial relativityEntityelectromagnetismEntitystrong interactionEntityweak interactionEntitySteven WeinbergEntityStandard ModelEntitystring theoryEntityquantum field theoryEntityTaylor seriesEntityFourier transformEntityrandom variableEntityfieldEntityQ118398EntityCategoriesCovariance and correlationQuantum field theory