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Composition factors from the group ring and Artin's theorem on orders of simple groups
 Proc. London Math. Soc
, 1990
"... The integral group ring of a finite group determines the isomorphism type of the chief factors of the group. Two proofs are given, one of which applies Cameron's and Teague's generalisation of Artin's theorem on the orders of finite simple groups to the orders of characteristically simple groups. Th ..."
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The integral group ring of a finite group determines the isomorphism type of the chief factors of the group. Two proofs are given, one of which applies Cameron's and Teague's generalisation of Artin's theorem on the orders of finite simple groups to the orders of characteristically simple groups. The generalisation states that a direct power of a finite simple group is determined by its order with the same two types of exception which Artin found. Its proof, given here in detail, adapts and makes explicit certain functions of a natural number variable which Artin used implicitly. These functions contribute to the argument through a series of tables which supply their values for the orders of finite simple groups. 1.
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"... Nonsimple abelian varieties in a family: geometric and analytic approaches Jordan S. Ellenberg, Christian Elsholtz, Chris Hall and Emmanuel Kowalski We consider, in the special case of certain oneparameter families of Jacobians of curves defined over a number field, the problem of how the property ..."
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Nonsimple abelian varieties in a family: geometric and analytic approaches Jordan S. Ellenberg, Christian Elsholtz, Chris Hall and Emmanuel Kowalski We consider, in the special case of certain oneparameter families of Jacobians of curves defined over a number field, the problem of how the property that the generic fiber of such a family is absolutely simple ‘spreads ’ to other fibers. We show that this question can be approached using arithmetic geometry or with more analytic methods based on sieve theory. In the first setting, nontrivial grouptheoretic information is needed, while the version of the sieve we use is also of independent interest.