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Function Theoretic Majorant Principles

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Analytic Functions
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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 zG; this measure is uniquely determined by the following conditions:

  1. 1.

    ω(z, α, G) is harmonic and bounded in G;

  2. 2.

    On α, ω assumes the value 1, and on the complementary are β, the value 0.

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References

  1. R. Nevanlinna [12].

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  2. We thus also take into consideration the possibility that the “region” A w may consist solely of the arcs α w .

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  3. 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 .

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  4. F. and R. Nevanunna [1], A. Ostrowski [1].

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  5. E. Phragmén and E. Lindelöf [1]. A still sharper form of this theorem was given by F. and R. Nevanlinna [1].

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  6. For more results of this kind, cf. F. and R. Nevanlinna [1].

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  7. E. Lindelöf [2].

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  8. 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.

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  9. Cf. O. Lehto [1].

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  10. F. Riesz [1].

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  11. Cf. the footnote 2 on p. 46.

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  12. This estimate is sharp, as is shown in VII, § 5.

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  13. K. Löwner [1].

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  14. G. Julia [1], C. Carathéodory [4].

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  15. 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].

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  16. E. Landau [1], G. Schottky [1].

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  17. Cf. R. Nevanlinna [12].

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  18. To remove the exceptional nature of the point at infinity, it is best to measure distances on the sphere.

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  19. 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.

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  20. E. Lindelöf [3].

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© 1970 Springer-Verlag Berlin Heidelberg

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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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  • DOI: https://doi.org/10.1007/978-3-642-85590-0_4

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-85592-4

  • Online ISBN: 978-3-642-85590-0

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