The definition of injective envelopes of an extension of a Hilbert C * modules over a C * algebra is introduced, and is characterized in terms of the injectivity and essence.
研究C 代数上HilbertC 模扩张的内射性和内射包络 ,通过内射性和本性给出内射包络的特征描述 。
In this paper, we study some properties of p-injective modules and their injective envelopes and discuss the injectivity of p-injective modules over commutative integral domains.
主要研究P -内射模及其内射包络的一些性质 ,并讨论了可换整环上P -内射模的内射
It is proved that a ring R is VN-regular if and only if the Cotorsion envelope and injective envelope of any R-module M are isomorphism,if and only if E(M)/M is flat as a R-module,where E(M) is injective envelope of M.
R是VN-正则环当且仅当任意R-模M的Cotorsion包络与内射包络是同构的,也当且仅当E(M)/M作为R-模是平坦的,其中E(M)是M的内射包络。
This paper studies the relief grinding problem of the hob of point contact worm gear drive and puts forward a one-parameter enveloping method to calculate the axial profile of relief grinding wheel.
本文研究了加工经可控曲率修正的蜗轮齿面的滚刀设计问题 ,建立了相应的数学模型 ,并应用计算铲磨蜗轮滚刀刃形曲线的单参数包络法 ,求出铲磨砂轮截形曲线。