Noetherian subrings of power series rings

Da Qing Wan
1995 Proceedings of the American Mathematical Society  
Let R be a commutative noetherian ring with unit. It is shown that certain subrings contained between the polynomial ring R[X] and the power series ring i?[^] [|T]] are also noetherian. These subrings naturally arise from studying p-adic analytic variation of zeta functions over finite fields.
doi:10.1090/s0002-9939-1995-1260186-4 fatcat:7qucfym45zaklmpvsyotahnfj4