Classical Ring-Structure Theorems

  • Frank W. Anderson
  • Kent R. Fuller
Part of the Graduate Texts in Mathematics book series (GTM, volume 13)


As we saw in the last chapter semisimple modules play a distinguished role in the theory of modules. Classically, the most important class of rings consists of those rings R whose category R M has a semisimple generator. A characteristic property of such a ring R, called a “semisimple” ring, is that each left R-module is semisimple. These rings are the objects of study in Section 13 where we prove the fundamental Wedderburn-Artin characterization of these rings as direct sums of matrix rings over division rings. In particular, a semisimple ring is a direct sum of rings each having a simple faithful left module. In Section 14 we study rings characterized by this latter property—the “(left) primitive” rings. Here we prove Jacobson’s important generalization of the semisimple case characterizing left primitive rings as “dense rings” of linear transformations.


Direct Summand Left Ideal Prime Ring Division Ring Artinian Ring 
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Copyright information

© Springer-Verlag New York, Inc. 1992

Authors and Affiliations

  • Frank W. Anderson
    • 1
  • Kent R. Fuller
    • 2
  1. 1.Department of MathematicsUniversity of OregonEugeneUSA
  2. 2.Department of MathematicsUniversity of IowaIowa CityUSA

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