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Hermann Hähl 《Monatshefte für Mathematik》1980,90(3):207-218
This paper is part of a program aiming at the classification of all higher-dimensional locally compact translation planes whose collineation groups have large dimension. In the present paper we determine all eight-dimensional locally compact translation planes which admit acompact collineation group of dimension at least 5 acting almost effectively on the translation axis. In fact, is isomorphic either to Spin4 or toSO
4(). The case Spin4() has already been treated elsewhere ([6]). Here, the planes with SO
4() are explicitly determined and studied in detail. 相似文献
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Hermann Hähl 《Geometriae Dedicata》1995,58(2):213-226
As a contribution to a classification of all sixteen-dimensional translation planes whose collineation group
has dimension at least 38, this paper deals with the case that
contains a subgroup (locally) isomorphic to SU2Spin5. Under various further assumptions, it is shown that such a plane satisfying dim
38 is necessarily isomorphic to the classical plane over the octonions.The complete classification will reveal that these further assumptions may in fact be omitted, except for the case that
even contains a subgroup isomorphic to Spin7. The latter planes have been explicitly determined in previous papers.
Meinem verehrten Lehrer Helmut Salzmann zum 65. Geburtstag 相似文献
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Hermann Hähl 《Geometriae Dedicata》1987,23(3):319-345
We study 16-dimensional locally compact translation planes in which, for an affine point o, the stabilizer
of the affine collineation group
contains a subgroup locally isomorphic to SU4 (). If has only one affine fixed point o, then it is shown that either the plane is the classical Moufang plane over the Cayley numbers, or else must be normal in the stabilizer
and
has dimension at most 37. This also comprises the proof of the fact that if
contains a subgroup locally isomorphic to SU4() × SL2() then the plane is the classical Cayley plane. The case that has more affine fixed points in dealt with as well; then, except for a well-known family of planes admitting Spin7() as a group of collineations,
has dimension at most 34. 相似文献
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Wilhelm Klingenberg 《Archiv der Mathematik》1958,9(1-2):152-154
Ohne Zusammenfassung
Hellmuth Kneser zum 60. Geburtstag gewidmet 相似文献
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Mathematische Zeitschrift - 相似文献
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Konrad Jörgens 《Mathematische Zeitschrift》1961,77(1):295-308
Ohne ZusammenfassungHerrnFriedrich Karl Schmidt zum 60. Geburtstag am 22. 9. 1961 gewidmet 相似文献
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Franz Kinzl 《Monatshefte für Mathematik》1979,87(2):109-121
LetS be a locally compact semigroup. It is shown that if a measure is absolutely continuous and ifS is cancellative, then the measure concentrated on a Borel subsetB ofS (i. e. =(B.)) is also absolutely continuous. Other properties of absolutely continuous measures will be obtained. Moreover we will answer the question when absolutely continuous probability measures exist. This is the case ifS admits an invariant integral on the space of all continuous functions onS with compact support. Another result is the following: If the compact semigroupS has a connected kernel then there exist absolutely continuous probability measures if and only ifS is amenable. 相似文献
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