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<p>In this paper, we use purely complex analytic techniques to prove two results of the first author which were hitherto given only probabilistic proofs. A general form of the Phragmén-Lindelöf principle states that if the <i>p</i><sup>th</sup> Hardy norm of the conformal map from the disk to a simply connected domain is finite, then an analytic function on that domain is either bounded by its supremum on the boundary or else goes to <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\infty \)</EquationSource> </InlineEquation> along some sequence more rapidly than <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(e^{|z|^{p}}\)</EquationSource> </InlineEquation>. We will prove this and discuss a number of special cases. We also derive a series expansion for the Green’s function of a disk, and show how it leads to an infinite product identity. The celebrated infinite product expansions for sine and cosine are realized as special cases.</p>

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Complex analytic proofs of two probabilistic theorems

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Greg Markowsky,
  • Clayton McDonald

摘要

In this paper, we use purely complex analytic techniques to prove two results of the first author which were hitherto given only probabilistic proofs. A general form of the Phragmén-Lindelöf principle states that if the pth Hardy norm of the conformal map from the disk to a simply connected domain is finite, then an analytic function on that domain is either bounded by its supremum on the boundary or else goes to \(\infty \) along some sequence more rapidly than \(e^{|z|^{p}}\) . We will prove this and discuss a number of special cases. We also derive a series expansion for the Green’s function of a disk, and show how it leads to an infinite product identity. The celebrated infinite product expansions for sine and cosine are realized as special cases.