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In this paper we study Moufang-Klingenberg planes M (A) defined over a local alternative ring A of dual numbers. We show that some collineations of M (A) preserve cross-ratio and thus establish a relation between harmonicity and harmonic position.

In this study we investigate the structures constructed by deleting a subplane from a projective Klingenberg plane. If the superplane and the subplane are infinite, then it can be easily seen that the remaining structure satisfies the conditions of a hyperbolic Klingenberg plane. In this study we show that the remaining structure is the hyperbolic Klingenberg plane if the inequality r ≥ m 2 + m +1+ √ m 2 + m +2h olds when the superplane and the subplane are fi nite andt, r and t, m are their parameters, respectively. MSC: 51D20; 05B25

Let PK2(Q(e)) be the projective Klingenberg plane coordinated by the dual quaternion ring Q(e )= Q + Qe = {x + ye | x, y ∈ Q} where Q is any quaternion ring. In this paper, we determine the addition and multiplication of the points on the line (0, 1, 0) ofPK2(Q(e)) as the image of some collineations of the plane PK2(Q(e)). To do this, we give the collineations Sa and La. Later we show that the addition and multiplication of the nonneighbor points on the line (0, 1, 0) can be obtained as the images under that Sa and La. MSC: 51C05; 51J10; 12E15

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.

In this paper, we show that D + D(epsilon) is a local ring under usual operations where D is a division ring. Also we construct a projective Klingenberg plane over D + D(epsilon).

Bu çalışma, 19-25 Eylül 2011 tarihleri arasında Halkidiki[Yunanistan]’de düzenlenen International Conference on Numerical Analysis and Applied Mathematics (ICNAAM)’da bildiri olarak sunulmuştur. In this paper, we investigate some combinatoric properties of the Projective Klingenberg planes coordinatized with a finite local ring R when the cardinality of set I of the non-unit elements of R is k. As a result we arrive at the result that the order of the projective plane underlying projective Klingenberg plane must be n k, which is the index of I in R when |R| = n. Although some of the results given here can be found in the literature [1], [3] and [4] we approach to them in a direct way and give alternative proofs. European Soc Computat Methods Sci & Engn (ESCMSE) R M Santilli Fdn ACC I S

This paper deals with Moufang-Klingenberg planes $\boldsymbol{M}(\mathcal{A}) $ defined over a local\ alternative ring $\mathcal{A}$\ of dual numbers. The definition of cross-ratio is extended to $\boldsymbol{M}(\mathcal{A})$. Also, some properties of cross-ratios and 6-figures that arewell-known for Desarguesian planes are investigated in $\boldsymbol{M}(\mathcal{A})$; so we obtain relations between algebraic properties of $\mathcal{A}$ and geometric properties of $\boldsymbol{M}(\mathcal{A})$. In particular, we show that pairwise non-neighbour four points of the line $g$ are in harmonic position if and only if they are harmonic, and that $\mu $ is Menelaus or Ceva 6-figure if and only if $r\left( \mu \right) =-1$ or $r\left( \mu \right) =1, $ respectively.

In this paper, the Moufang-Klingenberg plane over a local alternative ring R of dual numbers is studied. It is shown that its collineation group is transitive on quadrangles. It is therefore shown that the coordinatization of these Moufang-Klingenberg planes is independent of the choice of the coordinatization quadrangle. Also, the concept of 6-figures is extended to these Moufang-Klingenberg planes and it is shown that any 6-figure corresponds to only one inversible m epsilon R.

Let ( O , E , U , V ) Open image in new window be the coordination quadruple of the projective Klingenberg plane (PK-plane) coordinated with dual quaternion ring Q ( e ) = Q + Q e = { x + y e ∣ x , y ∈ Q } Open image in new window, where Q is any quaternion ring over a field. In this paper, we define addition and multiplication of points on the line O U = [ 0 , 1 , 0 ] Open image in new window geometrically, also we give the algebraic correspondences of them. Finally, we carry over some well-known properties of ordinary addition and multiplication to our definition.