Excerpt from Encyklopa¿die der Mathematischen Wissenschaften mit Einschluss Ihrer Anwendungen, Vol. 3: Geometrie, Zweiter Teil, Erste Hälfte

Die Kurven mit Polardreiseit und die Kurven mit Polarvierseit Eie Kurven von Clebsch, Lüroth und Humbert Kurven mit Kollineationen in sich, insbesondere die Kleinsche Kurve.

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