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Über Elementarkettenbrüche, lineare Substitutionen und indefinite binäre quadratische Formen : I.
(1919)
Über Elementarkettenbrüche, lineare Substitutionen und indefinite binäre quadratische Formen : II.
(1921)
Die Hilbertsche Grundlegung der Geometrie darf für alle analogen Untersuchungen als vorbildlich gelten. Zwei ihrer Eigenschaften sind es, auf die es hier ankommt. Erstens wird von allen sprachlichen Definitionen der Objekte, mit denen sie operiert, wie Punkt, Gerade, zwischen usw. abgesehen; nur ihre gegenseitigen Beziehungen und deren Grundgesetze werden axiomatisch an die Spitze gestellt. Zweitens werden die Axiome in verschiedene Gruppen gewisser Eigenart und Tragweite gespalten (die des Schneidens und Verbindens, die Axiome der Ordnung, der Kongruenz usw.), und es ist eine wesentliche Aufgabe des axiomatischen Aufbaues, zu prüfen, bis zu welchen Resultaten eine einzelne oder mehrere dieser Gruppen für sich führen. Die gleiche Behandlung eignet sich für die Mengenlehre. Von sprachlicher Einführung der Begriffe Menge, Bereich usw. ist daher ebenso abzusehen , wie von der des Punktes oder Raumes. Ebenso kann man hier gewiisse Axiomgruppen unterscheiden, die Axiome der Aquivalenz, die Axiome der Ordnung usw., und kann die gleichen Fragen stellen, wie im Gebiet der Geometrie. Dies soll im folgenden geschehen und zwar für denjenigen Teii, der nur mit dar Äquivalenz der Mengen, der Mengenteilung und Mengenverbindung, sowie der Mengenvergleichung operiert.....