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arXiv 1902.05916math.CV
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de Branges-Rovnyak空间中的外函数与发散

Outer functions and divergence in de Branges-Rovnyak spaces

Javad Mashreghi, Thomas Ransford

摘要:

在单位圆盘上多项式稠密的大多数经典全纯函数空间中,函数$f$可以用它的扩张函数$f_r(z):=f(rz)~(r<1)$在范数上逼近,换句话说,就是$\lim_{r\to1^-}\|f_r-f\|=0$。构造了多项式稠密的de Branges-Rovnyak空间${\mathcal H}(b)$和函数$f\in{\mathcal H}(b)$,使得$\lim_{r\to1^-}\|f_r\|_{{\mathcal H}(b)}=\infty$ .我们构造的本质特征在于$b$是一个外部函数。

英文摘要:

In most classical holomorphic function spaces on the unit disk in which the polynomials are dense, a function $f$ can be approximated in norm by its dilates $f_r(z):=f(rz)~(r<1)$, in other words, $\lim_{r\to1^-}\|f_r-f\|=0$. We construct a de Branges-Rovnyak space ${\mathcal H}(b)$ in which the polynomials are dense, and a function $f\in{\mathcal H}(b)$ such that $\lim_{r\to1^-}\|f_r\|_{{\mathcal H}(b)}=\infty$. The essential feature of our construction lies in the fact that $b$ is an outer function.

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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