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The relationship between K u 2 v H 2 and inner functions

Xiaoyuan Yang (2024)

Czechoslovak Mathematical Journal

Let u be an inner function and K u 2 be the corresponding model space. For an inner function v , the subspace v H 2 is an invariant subspace of the unilateral shift operator on H 2 . In this article, using the structure of a Toeplitz kernel ker T u ¯ v , we study the intersection K u 2 v H 2 by properties of inner functions u and v ( v ...

The return sequence of the Bowen-Series map for punctured surfaces

Manuel Stadlbauer (2004)

Fundamenta Mathematicae

For a non-compact hyperbolic surface M of finite area, we study a certain Poincaré section for the geodesic flow. The canonical, non-invertible factor of the first return map to this section is shown to be pointwise dual ergodic with return sequence (aₙ) given by aₙ = π/(4(Area(M) + 2π)) · n/(log n). We use this result to deduce that the section map itself is rationally ergodic, and that the geodesic flow associated to M is ergodic with respect to the Liouville measure. ...

The Riesz kernels do not give rise to higher dimensional analogues of the Menger-Melnikov curvature.

Hany M. Farag (1999)

Publicacions Matemàtiques

Ever since the discovery of the connection between the Menger-Melnikov curvature and the Cauchy kernel in the L2 norm, and its impressive utility in the analytic capacity problem, higher dimensional analogues have been coveted. The lesson from 1-sets was that any such (nontrivial, nonnegative) expression, using the Riesz kernels for m-sets in Rn, even in any Lk norm (k ∈ N), would probably carry nontrivial information on whether the boundedness of these kernels in the appropriate norm implies rectifiability...

The Schwarz-Pick theorem and its applications

M. Qazi, Q. Rahman (2011)

Annales UMCS, Mathematica

Various derivative estimates for functions of exponential type in a half-plane are proved in this paper. The reader will also find a related result about functions analytic in a quadrant. In addition, the paper contains a result about functions analytic in a strip. Our main tool in this study is the Schwarz-Pick theorem from the geometric theory of functions. We also use the Phragmén-Lindelöf principle, which is of course standard in such situations.

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