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Begründung Der Funktionentheorie: Auf Alten Und Neuen Wegen by Lothar Heffter

Begründung Der Funktionentheorie: Auf Alten Und Neuen Wegen

by Lothar Heffter
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Book cover type: Paperback
  • ISBN13: 9783540025535
  • Binding: Paperback
  • Subject: N/A
  • Publisher: Springer
  • Publisher Imprint: Springer
  • Publication Date:
  • Pages: 64
  • Original Price: EUR 46.68
  • Language: German
  • Edition: 2., Wesentl. Ve
  • Item Weight: 118 grams
  • BISAC Subject(s): Functional Analysis

Unter "Begrundung der Funktionentheorie" verstehen wir die auf moglichst elementarem Weg gewonnene Darstellung einer Funktion f (z) == u (x, y) + iv(x, y) von z == x + yi durch gewohnliche Potenzreihen, wenn iiber f(z) gewisse moglichst elementare Voraussetzungen gemacht werden. Diese konnen sehr verschiedener Art sein. Wahrend aber wohl aIle Lehrbiicher der Funktionentheorie nur einen der beiden "klassi- schen" Wege verfolgen, bei denen die Existenz der Ableitung f'(z) (GOURSAT) oder deren Existenz und Stetigkeit (CAUCHY) den Ausgangs- punkt bildet, werden hier auBer jenen beiden noch vier andere Wege bis zu dem genannten Endziel gebahnt. Einer von ihnen (MORERA 1901, 26) wird hauptsachlich nur aus historischem Interesse durchgefuhrt. Die drei anderen ruhren in der vorliegenden Gestalt vom Verfasser her und gehen von geringeren Voraussetzungen aus als GOURSAT, d. h. der Existenz von f' (z). Nur einer von ihnen war schon in der Schrift "Kurven- integrale und Begrundung der Funktionentheorie", Springer-Verlag 1948, enthalten. Damit war von mir ein Wunsch erfullt worden, in dem sich BOLZA, wie er mir erzahlte, 1912 in London mit HILBERT begegnet war. Wichtige Teile der Funktionentheorie beginnen erst nach der Be- griindung, wenn man also schon im Besitz der Potenzreihen fur f(z) ist. Auf diese Teile gehen wir nicht mehr ein, da wir ja nicht ein "Lehrbuch der Funktionentheorie", sondern gewissermaBen nur den A nfang eines sol chen auf sehr verschiedenen Wegen liefern wollen. Abschnitt A bringt Vorkenntnisse, die unmittelbar oder mittelbar wirklich benutzt werden, und zwar mit Beweisen der angefuhrten Satze.

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