hi...this is the problem: lim (ri)^n , when n -> infinite, i*i=-1 and r>0 thank you
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Originally Posted by inzaghina hi...this is the problem: lim (ri)^n , when n -> infinite, i*i=-1 and r>0 thank you Isn't it obvious that $\displaystyle r^n$ itself goes to infinity so there is no limit? In fact, even if r= 1, this sequence is i, -1, -i, 1, i, -1, -i, 1, ... and so does not converge. If $\displaystyle 0\le r< 1$ then it converges to 0.
thank u so much for your answer.
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