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Published online by Cambridge University Press: 20 November 2018
A surface of order three F in the real projective three-space P 3 is met by every line, not in F, in at most three points.
In the present paper, we determine the existence and examine the distribution of elliptic, parabolic and hyperbolic points; that is, the differentiable points of F which do not lie on any line contained in F.