EntityQ548536· pop 8· linked from 34 articlesnormal orderSign in to savetype of operator ordering in quantum field theoryConnectionsfinite differenceEntitycommutatorEntityquantum mechanicsEntityclassical mechanicsEntitydigital object identifierEntityInternational Standard Serial NumberEntityexponentiationEntitybosonEntityfermionEntityquantum field theoryEntityTaylor seriesEntitybibcodeEntityQ118398EntityexpectationEntitypartial derivativeEntityBose-Einstein statisticsEntityKronecker deltaEntityFermi–Dirac statisticsEntityzero-point energyEntityHamiltonian operatorEntityCategoriesQuantum field theory