Determine for the numerical semigroup ring K [ U 3 , U 4 , U 5 , … ] {\displaystyle {}K[U^{3},U^{4},U^{5},\ldots ]} unitary differential operators for the elements U 3 , U 4 , U 5 {\displaystyle {}U^{3},U^{4},U^{5}} .
![{\displaystyle {}K[U^{3},U^{4},U^{5},\ldots ]}](https://wikimedia.org/api/rest_v1/media/math/render/svg/0f7aee23977c89d27cdbba93e9bfa3a0de2e7fb0)
