设R和S是环，U是平坦右R-模，V是平坦右S-模．本文中我们证明了(N，(U，V))-lc．dim(R+S)=sup((N，U)-lc．dimR，(N，V)-lc．dimS)．......

Let S be an excellent extension of a ring R and U a flat right S-module. We show in this paper that the left (N,U)-coher......