Proving Commutativity in Groups with a^2 = e for all a in G

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Homework Help Overview

The discussion revolves around proving that a group G is commutative under the condition that for all elements a in G, a squared equals the identity element e.

Discussion Character

  • Exploratory, Mathematical reasoning

Approaches and Questions Raised

  • Participants explore the implications of the condition a^2 = e, questioning the results of specific products like aabb and abab. There is an emphasis on showing that ab = ba.

Discussion Status

Some participants have made progress in understanding the relationships between the products of group elements, with one indicating they have reached a conclusion. However, the discussion remains open with various interpretations being explored.

Contextual Notes

There is a focus on the definitions and properties of group elements, particularly the identity element and the implications of the given condition on group structure.

margaret23
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Could you also help me start this question

show that if a^2 = e for all a in G then G must be commutative. (where e is the identity)

thanks
 
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What does aabb equal? What does abab equal?
 
umm ok .. so i get that aabb must also =e .. but I am not sure how to get abab
 
Last edited:
margaret23 said:
umm ok .. so i get that aabb must also =e .. but I am not sure how to get abab

Just show that ab = ba.

That's what you're doing. Start from there.
 
margaret23 said:
umm ok .. so i get that aabb must also =e .. but I am not sure how to get abab
It's (ab)(ab), so you know aabb = abab. Can you finish that?
 
thanks :).. i got it now
 

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