How to Prove the Even Permutations in Sn Form a Group?

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SUMMARY

The discussion focuses on proving that the set of even permutations in the symmetric group Sn, denoted as An, forms a group. To establish this, one must demonstrate that the elements of An satisfy the group axioms under the operation of permutation composition. The specific case of A4 is mentioned, which consists of the even permutations of four elements. Participants seek resources to better understand group theory and permutations.

PREREQUISITES
  • Understanding of group theory principles
  • Familiarity with permutation operations
  • Knowledge of symmetric groups, specifically Sn
  • Basic mathematical proof techniques
NEXT STEPS
  • Study the properties of symmetric groups and their subgroups
  • Learn about the axioms of group theory in detail
  • Explore specific examples of even permutations in A4
  • Read "Abstract Algebra" by David S. Dummit and Richard M. Foote for comprehensive coverage of groups and permutations
USEFUL FOR

Students of abstract algebra, mathematicians interested in group theory, and anyone seeking to understand the structure of even permutations in symmetric groups.

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Homework Statement


Prove that the set of even permutations in Sn (i.e, An) is a group.
List the elements of A4


Homework Equations


How do I even try to prove these


The Attempt at a Solution


I have started a new course and am finding the problems very difficult.
Is there any books out there that can help me on groups and permutations.
Any help would be great.
Thanks
 
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You have to show that the elements of the set satisfy the axioms of a group under the group operation (which is not mentioned, but they probably mean combined permutation).
 

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