10. Let G be abelian and let H be a subgroup of G. Show that G/H is abelian.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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### Problem 10

Let \( G \) be abelian and let \( H \) be a subgroup of \( G \). Show that \( G/H \) is abelian.

#### Explanation

In this problem, you're asked to show that the quotient group \( G/H \), formed by dividing the group \( G \) (which is abelian) by its subgroup \( H \), is also abelian. 

**Definitions:**

- An **abelian group** is a group \( G \) where the operation is commutative, i.e., for any elements \( a, b \) in \( G \), the equation \( ab = ba \) holds.
  
- A **subgroup** \( H \) of a group \( G \) is a subset of \( G \) that is itself a group under the operation of \( G \).
  
- The **quotient group** \( G/H \) consists of the set of cosets of \( H \) in \( G \). Each coset is of the form \( gH \), where \( g \) is an element of \( G \).

**Objective:**

Your goal is to prove that the multiplication of cosets is commutative in the quotient group \( G/H \). More specifically, for any two elements \( aH \) and \( bH \) in \( G/H \), you need to show \( (aH)(bH) = (bH)(aH) \).

In summary, the task is to demonstrate that the operation in the quotient group \( G/H \) maintains the commutative property if the parent group \( G \) is abelian.
Transcribed Image Text:### Problem 10 Let \( G \) be abelian and let \( H \) be a subgroup of \( G \). Show that \( G/H \) is abelian. #### Explanation In this problem, you're asked to show that the quotient group \( G/H \), formed by dividing the group \( G \) (which is abelian) by its subgroup \( H \), is also abelian. **Definitions:** - An **abelian group** is a group \( G \) where the operation is commutative, i.e., for any elements \( a, b \) in \( G \), the equation \( ab = ba \) holds. - A **subgroup** \( H \) of a group \( G \) is a subset of \( G \) that is itself a group under the operation of \( G \). - The **quotient group** \( G/H \) consists of the set of cosets of \( H \) in \( G \). Each coset is of the form \( gH \), where \( g \) is an element of \( G \). **Objective:** Your goal is to prove that the multiplication of cosets is commutative in the quotient group \( G/H \). More specifically, for any two elements \( aH \) and \( bH \) in \( G/H \), you need to show \( (aH)(bH) = (bH)(aH) \). In summary, the task is to demonstrate that the operation in the quotient group \( G/H \) maintains the commutative property if the parent group \( G \) is abelian.
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