Universität Potsdam, Institut für Mathematik
Postfach 60 15 53, D-14415 Potsdam
Abstract: In this paper congruence planes with weak conditions on the congruence relation are investigated. Well-known and ``trivial'' properties (congruence axioms) from a lot of relevant papers receive a new rank and signification. Remarkable is the ``conjugate'' congruence relation.
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