On the De Branges theorem

Details On the De Branges theorem On the De Branges theorem

1996-03-05

arxiv.org/abs/math/9603216v1

Mathematics

Classical Analysis and ODEs

Scientific paper

Recently, Todorov and Wilf independently realized that de Branges' original proof of the Bieberbach and Milin conjectures and the proof that was later given by Weinstein deal with the same special function system that de Branges had introduced in his work. In this article, we present an elementary proof of this statement based on the defining differential equations system rather than the closed representation of de Branges' function system. Our proof does neither use special functions (like Wilf's) nor the residue theorem (like Todorov's) nor the closed representation (like both), but is purely algebraic. On the other hand, by a similar algebraic treatment, the closed representation of de Branges' function system is derived. In a final section, we give a simple representation of a generating function of the de Branges functions.

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