arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0803.0980math.CVmath.FA
收藏

代数$\mC +BH^\infty$的Corona定理与稳定秩

The Corona theorem and stable rank for the algebra $\mC +BH^\infty$

Raymond Mortini, Amol Sasane, Brett D. Wick

摘要:

设$B$是Blaschke积。我们用几种不同的方法证明了代数$H^\infty_B:=\mC+BH^\infty$的电晕定理。也就是说,我们证明了经典的{ \em电晕条件}对数据$f_1, ..., f_n \in H^\infty_B$:\[ \forall z \in \mD, \sum_{k=1}^{n} |f_k(z)| \geq δ>0, \]和{ \em可解的Bezout方程}的$g_1, ..., g_n \in H^\infty_B$:\[ \forall z\in \mD, \sum_{k=1}^n g_k (z)f_k(z)=1. \]的Bezout方程的解的估计的等价性。我们还证明了$H^\infty_B$的Bass稳定秩为1.令$A(\mD)_B$是来自$H^\infty_B$的所有元素的子代数,其具有到闭单位圆盘$\bar{\mD}$的连续扩张。对于$A(\mD)_B$也得到类似的结果。

英文摘要:

Let $B$ be a Blaschke product. We prove in several different ways the corona theorem for the algebra $H^\infty_B:=\mC+BH^\infty$. That is, we show the equivalence of the classical {\em corona condition} on data $f_1, ..., f_n \in H^\infty_B$: \[ \forall z \in \mD, \sum_{k=1}^{n} |f_k(z)| \geq δ>0, \] and the {\em solvability of the Bezout equation} for $g_1, ..., g_n \in H^\infty_B$: \[ \forall z\in \mD, \sum_{k=1}^n g_k (z)f_k(z)=1. \] Estimates on solutions to the Bezout equation are also obtained. We also show that the Bass stable rank of $H^\infty_B$ is 1. Let $A(\mD)_B$ be the subalgebra of all elements from $H^\infty_B$ having a continuous extension to the closed unit disk $\bar{\mD}$. Analogous results are obtained also for $A(\mD)_B$.

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。

↑