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Everything about Semisimple module

Direct sum of irreducible modules

In mathematics, especially in the area of abstract algebra known as module theory, a semisimple module or completely reducible module is a type of module that can be understood easily from its parts. A ring that is a semisimple module over itself is known as an Artinian semisimple ring. Some important rings, such as group rings of finite groups over fields of characteristic zero, are semisimple rings. An Artinian ring is initially understood via its largest semisimple quotient. The structure of Artinian semisimple rings is well understood by the Artin–Wedderburn theorem, which exhibits these rings as finite direct products of matrix rings. Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: Semisimple moduleA 5-minute orientation
  2. Skim a recent paper: Permutation Module Decomposition of the Second Cohomology of a Regular Semisimple Hessenberg VarietyInfluential work since 2022
  3. Pick up a classic book: A filtered category OS and applicationsThe most-reprinted book on the subject
  4. Read the landmark paper: The Nichols algebra of a semisimple Yetter-Drinfeld moduleCited 81 times
  5. Go sideways: Noncommutative ringA closely related topic
  6. Go sideways: Glossary of ring theoryA closely related topic

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