Download e-book for kindle: Artinian Modules over Group Rings by Leonid Kurdachenko, Javier Otal, Igor Ya Subbotin

By Leonid Kurdachenko, Javier Otal, Igor Ya Subbotin

ISBN-10: 376437764X

ISBN-13: 9783764377649

ISBN-10: 3764377658

ISBN-13: 9783764377656

From the reviews:

“The thought of modules over team jewelry RG for countless teams G over arbitrary earrings R is a truly large and complicated box of analysis with a number of scattered effects. … in view that the various effects seem for the 1st time in a ebook it may be prompt warmly to any professional during this box, but additionally for graduate scholars who're provided the great thing about the interaction of the theories of teams, earrings and representations.” (G. Kowol, Monatshefte für Mathematik, Vol. 152 (4), December, 2007)

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Extra resources for Artinian Modules over Group Rings

Example text

K. K. K. J. Zassenhaus [260, 261]). If X = C is the class of all Chernikov groups, then CC-groups are the groups with Chernikov conjugacy classes or CC-groups. D. Polovicky [225] introduced this class and obtained some initial results. Although CC-groups have not been investigated as far as F C-groups, they are subjects of many recent papers (see J. Alc´ azar and J. Otal [1], S. Franciosi, F. J. Tomkinson [77], M. Gonz´ alez and J. Otal [86, 87, 88], M. Gonz´ alez, J. M. Pe˜ na [89], J. M. Pe˜ na [209, 210, 211, 212, 213], J.

If A is a simple ZG-module, then A is a semisimple ZG-module. The next results describe other criteria of semisimplicity obtained with the aid of the well-known theorem of Maschke. We are considering here one of the most general versions of this result, which was obtained in the paper of S. Franciosi, F. A. Kurdachenko [74], and from it we will deduce several consequences. 9. Let R be a ring, G a group and H a normal subgroup of G such that G/H has finite order n. If A is an RG-module and B is an RG-submodule admitting an R-complement, then there exists an RG-submodule E such that nA ≤ B + E and n(B ∩ E) = 0 .

Thus our claim has just been proven and so CoreT Cn = M for all n ∈ N. Therefore T ∈ S and then S = ∅. We now choose a minimal element X of S. 2, we may assume that 1 ∈ X. Clearly X = 1 , so that Y = X \ 1 is a non-empty finite subset of G. By the minimality of X, Y ∈ S. Given a strictly infinite ascending chain of RH-submodules {Cn | n ∈ N} including M , we put En = Cn +CoreY Cn for every n ∈ N. Clearly En is an RH-submodule and En ≤ En+1 for every n ∈ N. Suppose that there exists some k ∈ N such that Ek+1 = Ek .

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Artinian Modules over Group Rings by Leonid Kurdachenko, Javier Otal, Igor Ya Subbotin


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