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Randomguess (talk | contribs) I think it is called Herglotz-Riesz theorem. See (26) on p60 in the cited paper of Riesz. |
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==References==
*{{citation|title=Über den Variabilitätsbereich der Koeffizienten von Potenzreihen, die gegebene Werte nicht annehmen|journal= Math. Ann.|year=1907|volume= 64|pages=95–115|first=C.|last=Carathéodory|doi=10.1007/bf01449883|url=https://zenodo.org/record/1428260/files/article.pdf}}
*{{citation|last=Duren|first=P. L.|title=
Univalent functions|series=Grundlehren der Mathematischen Wissenschaften|volume= 259|publisher= Springer-Verlag|year= 1983|isbn= 0-387-90795-5}}
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