论文标题
h(b)中m(a)的补体
The complement of M(a) in H(b)
论文作者
论文摘要
让$ b $在单位磁盘$ \ mathbb {d} $上$ h^{\ infty} $的单位球中的一个非Xtreme函数,让$ a $为外部$ h^{\ infty} $函数,使得$ |^2+|^2+| b |^2 = 1 $几乎在$ \ partial \ partial \ mathbb = d}上。 D. Sarason给出了$ \ Mathcal {m}(a)$ $ \ MATHCAL {m}(a)$的正交补充的足够和必要条件。在这里,我们明确描述了这个空间。
Let $b$ be a nonextreme function in the unit ball of $H^{\infty}$ on the unit disk $\mathbb{D} $ and let $a$ be an outer $H^{\infty}$ function such that $|a|^2+|b|^2=1$ almost everywhere on $\partial \mathbb{D}$. The sufficient and necessary conditions for the orthogonal complement of $\mathcal{M}(a)$ in $\mathcal{H}(b)$ be finite dimensional has been given by D. Sarason . Here we describe this space explicitly.