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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

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