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    How to 'undo' mod, or solve equation with a mod.?

    What about negative numbers? Or 0? For k. You're definitely in the right direction.
  2. N

    Proving group commutativity

    Suppose G is Abelian and it doesn't have that property. I already wrote the first line for you.
  3. N

    Proving group commutativity

    Suppose G is Abelian and it doesn't have that property. Show a contradiction that G must not be Abelian. Can you show a contradiction?
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    Equation for Finding Primes?

    andrewey, now you must determine which ones are primes from the list your equation gives you. Which is equally hard considering you don't even have all of them. Dodo pointed that out.
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