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Math Help - Find units in Z[i]

  1. #1
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    Find units in Z[i]

    Show that the only units in Z[i] are +1, -1, +i , -i.
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  2. #2
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    If a is a unit then N(a) = 1 if a=x+iy then N(a) = x^2+y^2 we need that x^2+y^2 = 1
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