摘要
对Ext对商及归纳极限成群的条件进行了研究.给出了:当A是—C~*-代数,I是A的闭双侧理想,Ext(A)是群时,Ext(A/I)是群的充要条件;若A=■(A_1,φ_(ij))且Ext(A_i)是群,则Ext(A)也是群.
If A is a C~*-algebra with the property that Ext(A)is a group,I is a closed two sided ideal,of A.A necessary andsufferent condition of Ext(A/I) is a group is given.That if A=lim(A_i,Φ_(jj))for all i and Ext(A_i)are groups,then Ext(A)is group.
出处
《陕西师大学报（自然科学版）》
CSCD
1991年第4期11-14,共4页
Journal of Shaanxi Normal University(Natural Science Edition)
基金
国家自然科学基金资助课题
