Abstract
Of the results in the first two chapters we shall need here above all the existence of the harmonic measure ω(z, α, G) of an are α with respect to a region G bounded by finitely many Jordan arcs (α + β) at the point z ∈ G; this measure is uniquely determined by the following conditions:
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1.
ω(z, α, G) is harmonic and bounded in G;
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2.
On α, ω assumes the value 1, and on the complementary are β, the value 0.
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R. Nevanlinna [12].
We thus also take into consideration the possibility that the “region” A w may consist solely of the arcs α w .
For by possibly extending the region A w one can always achieve a situation where w tends to an interior point (of continuity) of x w : afterwards one can again let the region tend to the original A w .
F. and R. Nevanunna [1], A. Ostrowski [1].
E. Phragmén and E. Lindelöf [1]. A still sharper form of this theorem was given by F. and R. Nevanlinna [1].
For more results of this kind, cf. F. and R. Nevanlinna [1].
E. Lindelöf [2].
A schlicht region G possesses a Green’s function if and only if the set of its boundary points is not “of harmonic measure zero”. This question will be investigated more thoroughly in Chapter V.
Cf. O. Lehto [1].
F. Riesz [1].
Cf. the footnote 2 on p. 46.
This estimate is sharp, as is shown in VII, § 5.
K. Löwner [1].
G. Julia [1], C. Carathéodory [4].
The theorem was given in the above final form by Carathéodory [4], The following simple proof stems from Landau and Valiron [1]. Cf. also my note [15].
E. Landau [1], G. Schottky [1].
Cf. R. Nevanlinna [12].
To remove the exceptional nature of the point at infinity, it is best to measure distances on the sphere.
H ν (ν = 1, 2) thus consists of the set of points w to which the function value w(z) comes arbitrarily close in an arbitrary neighborhood of P on α ν . According to this definition, H ν is either a point or a continuum.
E. Lindelöf [3].
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Nevanlinna, R. (1970). Function Theoretic Majorant Principles. In: Eckmann, B., van der Waerden, B.L. (eds) Analytic Functions. Die Grundlehren der mathematischen Wissenschaften in Einzeldarstellungen, vol 162. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-85590-0_4
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