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

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Let DD be a planar region bounded by finite analytic Jordan curves, let z0∈Dz_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⁡{∥f∥H(c)2(D)2:f∈H(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.

References

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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