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arXiv math/0309116math.RAmath.KT
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角环的稳定秩

Stable rank of corner rings

P. Ara, K. R. Goodearl

摘要:

B. Blackadar最近证明了单位C*-代数$A$中的任意满角$pAp$的K-理论稳定秩大于或等于$A$的稳定秩. (Here $p$是$A$中的投影,而丰满意味着$ApA=A$。)本文将这一结果推广到任意(有单位元)环$A$:若$p$是$A$中的满幂等元,则有$sr(pAp) \geq sr(A)$ .的证明部分依赖于代数类似物的Blackadar的方法,部分对一种新的技术,减少问题的更高的稳定秩的概念,稳定秩一个斜(矩形)角$pAq$。主要结果产生估计有关的稳定秩的Morita等价环。特别地,如果$B$同构于可由$n$元素生成的可生成的射影生成元$P_A$的自同态环,则$sr(A) \leq n{\cdot}sr(B)-n+1$。

英文摘要:

B. Blackadar recently proved that any full corner $pAp$ in a unital C*-algebra $A$ has K-theoretic stable rank greater than or equal to the stable rank of $A$. (Here $p$ is a projection in $A$, and fullness means that $ApA=A$.) This result is extended to arbitrary (unital) rings $A$ in the present paper: If $p$ is a full idempotent in $A$, then $sr(pAp) \geq sr(A)$. The proofs rely partly on algebraic analogs of Blackadar's methods, and partly on a new technique for reducing problems of higher stable rank to a concept of stable rank one for skew (rectangular) corners $pAq$. The main result yields estimates relating stable ranks of Morita equivalent rings. In particular, if $B$ is isomorphic to the endomorphism ring of a finitely generated projective generator $P_A$ which can be generated by $n$ elements, then $sr(A) \leq n{\cdot}sr(B)-n+1$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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