## CROSS-RATIOS IN MOUFANG-KLINGENBERG PLANES ABSVRACT. Certain geometric groups operating on a line g in a Moufang-Klingenberg plane J/ are described algebraically in terms of the underlying alternative ring R. For the case of the dual numbers R = A + Ae (A alternative field, e2= 0) a notion of c
Projectivities in Moufang-Klingenberg planes
โ Scribed by Andrea Blunck
- Publisher
- Springer
- Year
- 1991
- Tongue
- English
- Weight
- 711 KB
- Volume
- 40
- Category
- Article
- ISSN
- 0046-5755
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โฆ Synopsis
ABSaV.ACT. Let ~ยข' = (~, ยฃ.a, ~, =) be a Moufang-Klingenberg plane coordinatized by a local alternative ring R. We define the projectivities of a line 9 in Jยข geometrically as products of perspectivities. It is shown that under certain conditions the group of projectivities of 9 is generated by the algebraically defined permutations x ~ x + t (t E R), x ~ cx (c ~ R a unit),
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This paper deals with neighbor-preserving epimorphisms between arbitrary projective Klingenberg planes. Our main result is an algebraic characterization of such epimorphisms which generalizes a theorem of J. C. Ferrar and F, D. Veldkamp [2] for neighbor-preserving epimorphisms between projective rin
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