UsefulLinks
Mathematics
Group Theory
1. Introduction to Algebraic Structures
2. Definition of a Group
3. Fundamental Examples of Groups
4. Order of Elements and Groups
5. Subgroups
6. Cyclic Groups
7. Permutation Groups
8. Cosets and Lagrange's Theorem
9. Normal Subgroups and Quotient Groups
10. Group Homomorphisms
11. The Isomorphism Theorems
12. Group Actions
13. The Sylow Theorems
14. Direct Products and Sums
15. Structure of Finite Abelian Groups
16. Solvable and Nilpotent Groups
17. Composition Series and Jordan-Hölder Theorem
18. Free Groups and Presentations
19. Semidirect Products
20. Introduction to Representation Theory
21. Applications of Group Theory
17.
Composition Series and Jordan-Hölder Theorem
17.1.
Composition Series
17.1.1.
Definition and Examples
17.1.2.
Composition Factors
17.1.3.
Simple Groups in Composition Series
17.2.
Jordan-Hölder Theorem
17.2.1.
Statement and Proof
17.2.2.
Uniqueness of Composition Factors
17.3.
Refinement Theorems
17.3.1.
Schreier Refinement Theorem
17.3.2.
Zassenhaus Lemma
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16. Solvable and Nilpotent Groups
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18. Free Groups and Presentations