This is just one line from a larger proof about nth power solutions, but I don't understand how/why it's true. Any help?

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- April 3rd 2011, 09:58 AMpaupsersWhy does this congruence hold?
This is just one line from a larger proof about nth power solutions, but I don't understand how/why it's true. Any help?

- April 3rd 2011, 02:21 PMtonio
- April 3rd 2011, 03:16 PMBruno J.
This isn't true. For example , but for .

It's true if is a primitive root.