In the finite-dimensional case this result is already known: Strambach [ 14] resp. Schenkel [ 12] proved it for 2-dimensional M6bius resp. Minkowski planes. In his dissertation F6rtsch [4] proved the theorem in the finitedimensional case for all three types of Benz planes. However, in his proof Geometriae Dedicata 16 (1984) 351-357. 0046-5755/84/0163-0351501.05.
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