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Symmetric incidence groupoids |
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| Authors: | Herbert Hotje Silvia Pianta Elena Zizioli |
| Affiliation: | (1) Institut für Mathematik, Universität Hannover, Welfengarten 1, 30167 Hannover, Germany;(2) Dip. di Matematica e Fisica, Università Cattolica, Via Trieste, 17, 25121 Brescia, Italy;(3) Dip. di Matematica, Università degli Studi di Brescia, Facoltà di Ingegneria, Via Valotti 9, 25133 Brescia, Italy |
| Abstract: | In [7] point-reflection geometries were studied which can be derived from commutative kinematicspaces without involutory elements. But the class of point-reflection geometries is larger. For example, ellipticplanes with their reflections cannot be derived from commutative kinematic spaces. Here we investigate a largerclass of reflection geometries.This paper was sponsored by Vigoni Program 1999. |
| Keywords: | 51J05 20N02 20N05 |
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