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Cross-ratios of points and lines in some Moufang-Klingenberg planes

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Akpınar, Atilla
Çelik, Basri
Çiftçi, Süleyman

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Hacettepe Üniversitesi

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This paper deals with Moufang-Klingenberg planes M(A) defined over a local alternative ring A of dual numbers. The cross-ratio of concurrent lines is defined in a special case, and extended to the whole plane M(A). So, some results related to cross-ratios of points of M(A) are carried over to lines of M(A). Namely, we show that four pairwise non-neighbour lines passing through the point U are in harmonic position if and only if they are harmonic.

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Mathematics, Moufang-Klingenberg planes, Local alternative ring, Cross-ratio

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Akpınar, A. vd.(2011). "Cross-ratios of points and lines in some Moufang-Klingenberg planes". Hacettepe Journal of Mathematics and Statistics, 40(1), 1-13.

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