论文标题

指数riesz bases in $ l^2 $在两个间隔

Exponential Riesz bases in $L^2$ on two interval

论文作者

Belov, Yurii, Mironov, Mikhail

论文摘要

我们提供足够的条件,使指数系统成为$ l^2(e)$的riesz基础,其中$ e $是两个间隔的结合。我们证明这些条件几乎是必要的。此外,我们证明了此类系统的``额外点效应'',也就是说,可能会遇到$ l^2(e)$中的riesz基础在间隔中与riesz基础有所不同。

We give sufficient conditions for the exponential system to be a Riesz basis in $L^2(E)$, where $E$ is a union of two intervals. We show that these conditions are close to be necessary. In addition, we demonstrate ``extra point effect'' for such systems, i.e. it may happen that the Riesz basis in $L^2(E)$ differs by one point from the Riesz basis on an interval.

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