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PID math problem

  • Thread starter pivoxa15
  • Start date
  • #1
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Homework Statement


If R is a PID then all its ideals can be generated by a single element. It dosen't imply that every element in R can generate an ideal does it?




The Attempt at a Solution


I have to agree that it dosen't but can't think of a proof.
 

Answers and Replies

  • #2
StatusX
Homework Helper
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Of course in any ring, any element can generate an ideal, the ideal generated by that element.
 
  • #3
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You are right. Each element can always generate an ideal, namely a principle ideal. If R is a PID than it tells us that all the ideals in R are those that have been generated by a single element hence are all principle ideals.

However one can turn any principle ideal into a nonprinciple ideal. i.e. in Z. <3> is a Principle ideal. Instead of denoting it by <3> we denote this ideal by {0, 3} or {3, 6} and either of those two will be equivalent to <3>.
 
  • #4
StatusX
Homework Helper
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It's still the same ideal, and is still a principal ideal, which is just an ideal that can be generated by a single element, regardless of whichever generating set you choose to focus on.
 

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