International Journal of Computational and Mathematical Sciences, vol.4, no.6, pp.304-308, 2010 (Refereed Journals of Other Institutions)
In this paper we are interested in Moufang-Klingenberg planes M(A) defined over a local alternative ring A of dual numbers. We show that a collineation of M(A) preserve cross-ratio. Also, we obtain some results about harmonic points.