Show that the only units in Z[i] are +1, -1, +i , -i.
Follow Math Help Forum on Facebook and Google+
If $\displaystyle a$ is a unit then $\displaystyle N(a) = 1$ if $\displaystyle a=x+iy$ then $\displaystyle N(a) = x^2+y^2$ we need that $\displaystyle x^2+y^2 = 1$
View Tag Cloud