Let N be a nonempty set and o a permutation of N. Define a relation a~b if and only if b = o"(a) for some n E Z. Show that ~ is an equivalence relation and write down the elements of the equivalence class of a E N. on N as follows:

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Modern Algebra question help please.

3. Let Ω be a nonempty set and σ a permutation of Ω. Define a relation ~ on Ω as follows:  
\( a \sim b \) if and only if \( b = \sigma^n(a) \) for some \( n \in \mathbb{Z} \). Show that ~ is an equivalence relation and write down the elements of the equivalence class of \( a \in \Omega \).
Transcribed Image Text:3. Let Ω be a nonempty set and σ a permutation of Ω. Define a relation ~ on Ω as follows: \( a \sim b \) if and only if \( b = \sigma^n(a) \) for some \( n \in \mathbb{Z} \). Show that ~ is an equivalence relation and write down the elements of the equivalence class of \( a \in \Omega \).
Expert Solution
Step 1

Given, Ω is a nonempty set and σ a permutation of Ω.

A relation on the set is defined as a~b if and only if b=σn(a), n.

To show that this defines an equivalence relation.

 

Also, σn(a) means n times the element a is permuted i.e. σn=σσσ.... of n times.

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