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Boundary limits of subharmonic functions in the disc. (English) Zbl 0561.31003

In this note we prove the following: Let \(f\not\equiv -\infty\) be subharmonic in \(| z| <1\) satisfying \(\lim_{r\to 1}\int^{2\pi}_{0}f(re^{i\theta})d\theta =0\) with f(z)\(\leq 0\); then \(\limsup_{r\to 1}(1-r)\inf_{| z| =r}f(z)=0\).

MSC:

31A20 Boundary behavior (theorems of Fatou type, etc.) of harmonic functions in two dimensions
31A05 Harmonic, subharmonic, superharmonic functions in two dimensions
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