Abstract Algebra 4.6: Euler Phi Function

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We look at a number theoretic function, and how it can be used to help determine the order of a group element.
  1. Patrick Jones
  2. abstract algebra
  3. order
  4. phi function
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Hi there,
Take the example of Z/20Z. Elements with order 11. Phi(11)=10. { x I xeZ/20Z, ord(x) = 11} = {}. How ist that a multiple of 10? Or do you consider 0x a multiple of x? Kind regards and thanks.

mahmutbarrista