Geodesic
On an Observation of M. Riesz
Canadian mathematical bulletin, Tome 4 (1961) no. 1, pp. 70-71

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On a recent visit to Toronto, Professor Riesz made an interesting remark on the invariance of a certain cross-ratio, I wish to present a simple proof of his result.Let x = ( x1, x2, x3, x4), ... denote homogeneous coordinates in real projective three-space; x(t), ... are differentiable curves in that space. 
Scherk, P. On an Observation of M. Riesz. Canadian mathematical bulletin, Tome 4 (1961) no. 1, pp. 70-71. doi: 10.4153/CMB-1961-012-3
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