Ein Problem der Affingeometrie. (German) JFM 53.0707.04

wei Flächen haben dann und nur dann dasselbe System von Affinnormalen, wenn ihre affinen Hauptkrümmungen \(r_1\), \(r_2\) durch eine bilineare Relation
\( r_1r_2+\alpha(r_1+r_2)+\beta=0 \)
verknüpft sind.
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[1] W. Blaschke, Differentialgeometrie II, S. 132. Berlin: Julius Springer 1923.
[2] W. Blaschke, Differentialgeometrie. II, S. 164.
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