Abstract Algebra: Find Generators & Relations for Z2+Z2+Z2

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SUMMARY

The minimum number of generators required for the group Z2 + Z2 + Z2 is three. This is established by the fact that each generator corresponds to an independent element of the group, and the relations can be defined as {a, b, c | a^2 = b^2 = c^2 = e}, where e is the identity element. However, additional relations are necessary to ensure the group is abelian, as the initial presentation alone leads to an infinite group. Thus, a complete understanding of the group's structure requires both the generators and the appropriate relations.

PREREQUISITES
  • Understanding of group theory concepts, specifically abelian groups.
  • Familiarity with the notation and properties of Z2 (the cyclic group of order 2).
  • Knowledge of generators and relations in the context of group presentations.
  • Basic comprehension of element orders within groups.
NEXT STEPS
  • Study the properties of abelian groups and their generators.
  • Learn about group presentations and how to derive relations from generators.
  • Explore the concept of element orders in finite groups.
  • Investigate examples of other groups with similar structures, such as Z3 + Z3.
USEFUL FOR

This discussion is beneficial for students and educators in abstract algebra, particularly those studying group theory, as well as mathematicians interested in the structure of finite groups.

tyrannosaurus
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Homework Statement


What is the minimum number of generators needed for Z2+Z2+Z2? Find a set of generators and relations for this group.


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The Attempt at a Solution


I think it is obvious that the minimum amount of generators that you need is three, with Z2+Z2+Z2 = {a,b,c|a^2=b^2=c^2} but I don't know what I have to put down for the relations in the group and I am not sure how to explain that the minimum is 3 generators. Any help would be great!
 
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It's not 'obvious' that the minimal number of generators is three until you explain why you think it is. And I have no idea what Z2+Z2+Z2 = {a,b,c|a^2=b^2=c^2} is supposed to mean. Can you explain?
 
To show that you can't have two generators: what do you know about the order of elements in the group?

In terms of the relations, you definitely need more than just a^2=b^2=c^2=e since the group with that presentation is infinite. What about relations to make the group abelian?
 

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