Rational division algebras as solvable crossed products |
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Authors: | Jack Sonn |
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Institution: | (1) Department of Mathematics, Technion-Israel Institute of Technology, Haifa, Israel |
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Abstract: | LetG be a finite group. If there exists a division algebra central over the rationalsQ which is a crossed product forG, then according to a theorem of Schacher, the Sylow subgroups ofG are all metacyclic. The converse is proved here to hold in the following cases: (1)G metacyclic; (2) The Sylow 2-subgroups ofG are cyclic (this impliesG solvable); (3)G is solvable and the Sylow 2-subgroups ofG are dihedral of order larger than 8. |
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