Modules over coproducts of rings
Modules over coproducts of rings
复制标题
环余积上的模
DOI:
10.1090/s0002-9947-1974-0357502-5
复制
发表时间:
1974
影响因子:
1.3
通讯作者:
G. Bergman
中科院分区:
文献类型:
--
作者:
G. Bergman
Let Ro be a skew field, or more generally, a finite product of full matrix rings over skew fields. Let (RX)XEA be a family of faithful Rorings (associative unitary rings containing RO) and let R denote the coproduct ("free product") of the RX as R0-rings. An easy way to obtain an R-module M is to choose for each X E A U {0} an Rx-module Mx, and put M = MA OR; R. Such an M will be called a "standard" R-module. (Note that these include the free R-modules.) We obtain results on the structure of standard R-modules and homomorphisms between them, and hence on the homological properties of R. In particular: (1) Every submodule of a standard module is isomorphic to a standard