论文标题
关于极端要点的问题
Questions about extreme points
论文作者
论文摘要
我们讨论了单位球的几何形状 - 特别是其极端点的结构(如果有的话) - 在圆圈的$ l^1 $和$ l^\ infty $的子空间中,这些圆圈由具有规定的频谱差距的功能形成。 $ h^\ infty $中的Toeplitz运营商的内核也考虑了类似的问题。
We discuss the geometry of the unit ball -- specifically, the structure of its extreme points (if any) -- in subspaces of $L^1$ and $L^\infty$ on the circle that are formed by functions with prescribed spectral gaps. A similar issue is considered for kernels of Toeplitz operators in $H^\infty$.