Prove that {(1), (1, 2)(3, 4), (1, 3)(2,4), (1, 4)(2,3)} is a subgroup of S4.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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
Transcribed Image Text:**Problem Statement:**
Prove that the set \(\{(1), (1,2)(3,4), (1,3)(2,4), (1,4)(2,3)\}\) is a subgroup of \(S_4\).
**Explanation:**
In this problem, we are given a set of permutations and asked to prove that this set forms a subgroup of the symmetric group \(S_4\), which is the group of all permutations on four elements.
**Steps to Prove Subgroup:**
1. **Identity Element:**
- The set contains the identity permutation \((1)\), which satisfies one of the subgroup criteria.
2. **Closure:**
- Verify that the multiplication of any two elements in the set results in an element that is also within the set.
- For example, multiplying \((1,2)(3,4)\) by \((1,3)(2,4)\) should result in another element from the set.
3. **Inverses:**
- Check that the inverse of each element in the set is also contained in the set.
- For example, \((1,2)(3,4)\) is its own inverse, and similarly for the other elements.
By verifying these properties, we can establish that the given set is indeed a subgroup of \(S_4\).
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