The Jacobson Radical of Group Algebras by Gregory Karpilovsky

By Gregory Karpilovsky

Allow G be a finite staff and permit F be a box. it truly is renowned that linear representations of G over F might be interpreted as modules over the crowd algebra FG. hence the research of ring-theoretic constitution of the Jacobson radical J(FG) of FG is of basic value. over the past twenty years the topic has been pursued by means of a couple of researchers and plenty of attention-grabbing effects were received. This quantity examines those results.

The major physique of the speculation is gifted, giving the principal principles, the elemental effects and the basic equipment. it really is assumed that the reader has had the an identical of a regular first-year graduate algebra direction, hence familiarity with uncomplicated ring-theoretic and group-theoretic strategies and an knowing of effortless houses of modules, tensor items and fields. A bankruptcy on algebraic preliminaries is incorporated, offering a survey of issues wanted later within the ebook. there's a rather huge bibliography of works that are both without delay proper to the textual content or provide supplementary fabric of interest.

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T(~~)) Since = G, as we require. (Er'~) - 1, it is immediate that 45 5. C. Wall on the torsion of determinants of group rings. This result is absolutely vital to our study because it complements the group logarithm introduced in the next chapter. This is because the group logarithm describes determinants of local group rings modulo torsion. The results of this chapter are taken from [Wl}. finite p-group with lrl = pn Let r be a Let K be a finite extension of~ • We p denote the group of p-power roots of unity in K by ~K' and, for the sake of brevity, we shall write 0 in place of OK.

At p, and 1 elsewhere. w) 2 ~ 0 l 19 (being the discriminant of L /K ), it can be seen that p §5. p DUALITY Let K again be a numberfield and r be a finite group. In this section we will describe the effect of duality under the isomorphisms cr,p of §3. The results of this section are all due to Frohlich cf. [Fl], [F2]. Throughout this section we simultaneously use K-linear involution on Kr induced by y virtual character X of r, we write + x for y- 1 to denote the for y E r, and, for a contragredient virtual character.

R2 ) denote the Grothendieck group of Q~ab ~ Qc (resp. Q(~ )oE ~ Qc) modules. n' and we abbreviate HomQq(Ri' 0;) to Hi' and HomQ (R~, 0;) to H. Q Note that for ~. the superscript + on Homnq is superfluous, because ~ has no irreducible symplectic characters. 7) where K is the kernel of the lower right hand map; exact. l at all primes different from p. l [~ }oE)} p p p p t+'p We denote the right hand term by K'. 9 For t "' p Det(7l [ 1;; ] p t Proof ol:*) We are required to show that Det(7l [I;; ] ol:*) (n) p t O* Lt This follows from the following two results: Det(z)(n) (ii) Q(l;; )/L.

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