Abstract
The object of this article is to prove a necessary and sufficient condition such that the orthogonality defined by Dembowski and Hughes in the case of characteristic different from 2 (see [4]) satisifes the following axiom: Two orthogonal circles are secant.
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References
Benz, W., ‘Über Möbiusebenen’, Ein Bericht, Jahresber. Deutsche Math. Ver. 63 (1960), 1–27.
Bourbaki, N., ‘Elements de Mathématiques’, Fascicule XXIV, Livre II, Algèbre, Chap. 9, Formes sesquilinéaires et formes quadratiques, Hermann, 1959.
Dembowski, P., Finite Geometries, Springer, Berlin, Heidelberg, New York, 1968.
Dembowski, P. and Hughes, D. R., ‘On Finite Inversive Planes’, J. London Math. Soc. 40 (1965), 171–182.
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Mencerrey, Y. Miquelian inversive planes which admit an orthogonality both in the sense of Dembowski and Hughes and of Benz. Geom Dedicata 27, 199–202 (1988). https://doi.org/10.1007/BF00151350
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DOI: https://doi.org/10.1007/BF00151350