# of automorphisms of a cyclic group

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SUMMARY

The discussion focuses on finding all automorphisms of a cyclic group of order 10. It is established that there are 4 elements of order 5, 4 elements of order 10, 1 element of order 1, and 1 element of order 4. The conclusion drawn is that there are exactly 4 automorphisms, as once the generator is selected, the entire group structure is determined.

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  • Understanding of cyclic groups and their properties
  • Familiarity with group theory terminology
  • Knowledge of automorphisms and their significance in group theory
  • Basic concepts of group orders and element orders
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  • Study the structure of cyclic groups in more detail
  • Learn about the concept of automorphisms in group theory
  • Explore the relationship between group generators and automorphisms
  • Investigate other examples of automorphisms in different group orders
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Mathematics students, particularly those studying abstract algebra, group theory enthusiasts, and educators looking to deepen their understanding of cyclic groups and automorphisms.

R.P.F.
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Homework Statement


Find all the automorphisms of a cyclic group of order 10.


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The Attempt at a Solution



I think it might be useful if I could first figure out how many automorphisms are there. There are 4 elements of order 5, 4 elements of order 10, 1 element of order 1 and 1 element of order 4. So is the # of automorphisms 4!4! ?
 
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Try thinking about the automorphisms as mapping the generator of the group to another element
 
Office_Shredder said:
Try thinking about the automorphisms as mapping the generator of the group to another element

Yeah I just realized that once the generator is picked, then the whole group is well defined. So there should be 4 automorphisms?
 

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