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18810Re: [PrimeNumbers] Re: Complex primes?

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  • Joshua Zucker
    Mar 20, 2007
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      On 3/20/07, Rob <robdine@...> wrote:
      > Isn't i+1 = i*(1-i) and so not prime?
      > rob

      Hi Rob,
      that's analogous to saying "Isn't 7 = -1 * -7 and so not prime?"

      The rules for primes are no divisors except for UNITS and themselves,
      where units are things that have reciprocals. Since 1/i = -i is also
      a Gaussian integer, it's a unit and so we don't count it.

      --Joshua Zucker
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