Abstract
It is shown that with minor exceptions all projective Klingenberg planes are Moufang exactly if they have a trilateral each of whose sides is the line at infinity of a translation plane; but there are non-Moufang projective Klingenberg planes which have a single line which produces an equiaffine translation plane or a point P so that all lines through P, except perhaps for some neighbour lines, produce translation planes.
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The authors gratefully acknowledge the support of the Natural Sciences and Engineering Research Council of Canada.
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Baker, C.A., Lane, N.D. & Lorimer, J.W. An Affine Characterization of Moufang Projective Klingenberg Planes. Results. Math. 17, 27–36 (1990). https://doi.org/10.1007/BF03322627
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DOI: https://doi.org/10.1007/BF03322627