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Continuity of functors with respect to generalized inductive limits
Authors:Jiajie HUA  Xiaochun FANG  Xiao-Ming XU
Institution:1. School of Mathematics Physics and Information Engineering, Jiaxing University, Jiaxing 314001, China2. Department of Mathematics, Tongji University, Shanghai 200092, China3. School of Science, Shanghai Institute of Technology, Shanghai 201418, China
Abstract:Let (Ai,|ϕi,i+1) be a generalized inductive system of a sequence (Ai) of unital separable C*-algebras, with A=limi(Ai,ϕi,i+1). Set ϕj,i=ϕi?1,io?oϕj+1,j+2oϕj,j+1 for all i>j: We prove that if ϕj,i are order zero completely positive contractions for all j and i>j; and L:=inf{λ|λσ(ϕj,i(1Aj))} for all j and i>j}>0; where σ(ϕj,i(1Aj)) is the spectrum of ϕj,i(1Aj) ; then limi(Cu(ai),Cu(ϕi,i+1))=Cu(A) ; where Cu(A) is a stable version of the Cuntz semigroup of C*-algebra A: Let (An,ϕm,n) be a generalized inductive system of C*-algebras, with the ϕm,n order zero completely positive contractions. We also prove that if the decomposition rank (nuclear dimension) of An is no more than some integer k for each n; then the decomposition rank (nuclear dimension) of A is also no more than k:
Keywords:Completely positive map  order zero  generalized inductive limits  classification of C*-algebra  
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