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1.
For a translation plane P with respect to f we consider the group of collineations generated by all elations fixing f and a point F of f. All subgroups or are determined which operate regularly on the points of the affine plane P. Group-theoretic and operating properties of the groups are stated especially for the finite and the Desarguesian cases. In the latter case the companion NL-near modules are constructed. Finally we characterize the groups within PGL(3, K) with commutative field K of finite characteristic.  相似文献   

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The question, whether the Archimedean ordering of only one of the ternary rings of a projective plane implies that is Archimedean, i.e. that every ternary ring of is Archimedean, is answered in the negative by the construction of local-Archimedean orderings of free planes. There exists even Archimedean affine planes with non-Archimedean associated projective planes.  相似文献   

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Ohne ZusammenfassungHerrnHelmut Grunsky zum 60. Geburtstag am 11. Juli 1964 gewidmet  相似文献   

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We consider integral coverings y:{1,2,..,} of an affine plane which occur when is moved under a continuous periodic affine motion(t):. One can distinguish normal points × , i.e. is constant in a certain neighborhood of x, and singular points. If (x) is the number of times x passes through its orbit (t)x all normal points x have (x)=1, and the set of all singular points consists of a number of isolated points and lines. If (x) is the tangent rotation number of the orbit of x all singular points lie on the moving pole curve.  相似文献   

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Ohne Zusammenfassung Reinhold Baer zu seinem sechzigsten Geburtstag in alter unveränderter Freundschaft gewidmet  相似文献   

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Ohne ZusammenfassungDiese Arbeit entstand im Rahmen eines Auslandstipendiums der Deutschen Forschungs-gemeinschaft, welcher ich an dieser Stelle meinen Dank ausspreche.  相似文献   

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By separating the compatibility conditions for incidence, order and congruence the axioms for absolute planes in [3] are put in a somewhat more lucid form.

Die absoluten Ebenen aus [3] entsprechen den Ebenen, die die ebenen Axiome der Verknüpfung, die Axiome der Anordung und die Axiome der Kongruenz aus D.HilbertsGrundlagen der Geometrie erfüllen.

Werner Leiner zum 60. Geburtstag  相似文献   

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