令σ为有理数加群Q到除环K的自同构群Aut(K)的群同态,K[Q,σ]为Q上的斜群环,V是K上的全赋值环,K(Q,σ)是K[Q,σ]的左商环。本文对Q上的分次映射和K[Q,σ]上的(e)类分次扩张进行完全刻画。
Let a be a group homomorphism from Q to Aut(K),K[Q,σ] be the skew group ring of Q,and V be a total valuation ring of K. Let K(Q,σ) be the quotient ring of K[Q,σ]. In this paper,complete descriptions of graded maps over Q and graded extensions of type (e) over K[Q,σ] are given.