论文摘要
设A为一个C*—代数(不一定有单位,也不一定可交换)。{Ei}i∈I为一族Hilbert A-模,则它们的无限直和(?)Ei仍为Hilbert A-模。记L(E,E)={t|t∶E→E,(?)t*∶E→E,使得〈tx,y〉=〈x,t*y〉,(?)x,y∈E},则L(E,E)为一个C*-代数。 设J为拓扑分次C*-代数B的闭的双边理想,定义J1=〈J ∩ Be〉为由J ∩ Be生成的理想;J2={b∈B|Ft(b)∈J,(?)t∈Γ};J3=IndJ={b∈B|Fe(b*b)∈J},则有J1(?)J2=J3,且J3为B的一个理想。记B∞=Span{bt|bt∈Bt,t∈Γ},我们有如下结论:拓扑分次C*-代数B的理想I是对角不变的充要条件为:(?)I(?)IndJ,对B的某个理想J。 设(G1,E1),(G2,E2)为两个拟格序群,记TE1,TE2为相应的Toeplitz算子代数。设φ:G1→G2为一个保单位的群同态,使得φ(E1)(?)E2。则上述两个Toeplitz算子代数的自然同态映照成为C*-代数的单同态的充要条件为下列条件同时成立:(1)当x,y∈局时,φ(x)=φ(y)(?)x=y。(2)(?)x,y∈E1,x(?)y∈E1(?)φ(x)(?)φ(y)∈E2;当x(?)y∈E1时,φ(x(?)y)=φ(x)(?)φ(y)。(3)φ(G1)∩E2=φ(E1)。作为应用,我们刻划了Toeplitz算子代数的归纳极限。
论文目录
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