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Wolfgang Walter 《Mathematische Zeitschrift》1960,74(1):191-208
Ohne ZusammenfassungHerrnErich Kamke zum 70. Geburtstag am 18. August 1960 gewidmet 相似文献
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Armin Herzer 《Journal of Geometry》1979,12(2):104-131
Every affine central collineation of a translation plane induces a special collineation of the projective space spanned by the spreadF belonging to . Here the relations between these special collineations of and certain incidence propositions inF are investigated; so new proofs are given for some characterisations of (A,B)-regular spreads included in [7]. 相似文献
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Bruno Zimmermann 《manuscripta mathematica》1985,51(1-3):225-242
Let M be a closed aspherical manifold and A a finite subgroup of the outer automorphism group Out 1M of 1M. A necessary (and in many cases also sufficient) condition for realising A by the induced action of an isomorphic group of homeomorphisms of M is the existence of an extension 11MEA1 to the abstract kernel (A,1M, AOut 1M). If the center of 1M is nontrivial, this condition need not be fulfilled ([14]). We showed in [25] however that one can always find a surjection BA of a finite group B with abelian kernel such that there exists an extension to the abstract kernel (B,1M,BAOut1M), and one can try to realize B instead of A. The main result of the present paper is a characterisation of all such groups B (for a given A) which can be realized by a group of homeomorphisms. The class of manifolds considered here consists of certain Seifert fiber spaces in arbitrary dimensions but the main result is purely algebraic and can be applied to other classes of manifolds, for example to flat Riemannian manifolds. 相似文献
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Christian Pauc 《Archiv der Mathematik》1948,1(1):29-41
Ohne ZusammenfassungDieser Bericht enthält den Stoff von drei Vorträgen, die ich dank einer freundlichen Einladung von Prof. Süss im Mathematischen Forschungsinstitut in Oberwolfach am 11., 12. und 13. August 1947 gehalten habe. 相似文献
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