Saitoh's strict inequality conjecture for conjugate Hardy and Bergman kernels

From papers

Let DD be a planar region bounded by finite analytic Jordan curves, let z0Dz_0\in D, and let BD(z0)B_D(z_0) denote the Bergman kernel on DD. Let K^D(z0)\hat K_D(z_0) be the conjugate Hardy H2H^2 kernel, defined by

K^D(z0):=1inf{fH(c)2(D)2:fH(c)2(D) & f(z0)=1}.\hat K_D(z_0):=\frac{1}{\inf\left\{\|f\|^2_{H^2_{(c)}(D)}:f\in H^2_{(c)}(D)\ \&\ f(z_0)=1\right\}}.

Saitoh's conjecture. If DD is not simply connected, then

K^D(z0)>πBD(z0).\hat K_D(z_0)>\pi B_D(z_0).

This conjecture compares the conjugate Hardy H2H^2 kernel with the Bergman kernel and predicts strict inequality for multiply connected planar regions. Its resolution status is not specified in the supplied text.

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Sources & referencesView supporting material

Primary source

Qi'an Guan and Zheng Yuan, “A generalization of the conjugate Hardy H^2 spaces”, arXiv:2307.15446 (2023).

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