Saitoh's conjecture for conjugate Hardy H2H^{2} kernels

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Let DD be a planar regular region whose boundary consists of nn analytic Jordan curves. Let R^(z,wˉ)\hat{R}(z,\bar{w}) be its conjugate Hardy H2H^{2} kernel and B(z,wˉ)B(z,\bar{w}) its Bergman kernel; write R^(z)=R^(z,zˉ)\hat{R}(z)=\hat{R}(z,\bar{z}) and B(z)=B(z,zˉ)B(z)=B(z,\bar{z}). Saitoh's conjecture. If n>1n>1, then

R^(z)>πB(z).\hat{R}(z)>\pi B(z).

The conjecture compares the diagonal conjugate Hardy H2H^{2} and Bergman kernels on multiply connected planar regions. The paper proves this strict inequality, resolving the conjecture.

References

Primary source

Qi'an Guan, “A proof of Saitoh's conjecture for conjugate Hardy H^2 kernels”, arXiv:1712.04207 (2018).

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