Two complex limits
Posted: Thu Jul 14, 2016 1:54 pm
Choose that branch of the logarithmic function for which the argument function takes its values in \( \displaystyle ( -\pi , \pi ] \).
(1) Compute the limit
\[ \displaystyle \lim_{n \to \infty} \left[ i^{i} (2i)^{2i} \dots (ni)^{ni} \right] \]
(2) Consider the sequence \( (z_{n})_{n \in \mathbb{N}} \) of complex numbers defined by \( z_{n} = \frac{i}{n} \). Show that
\[ \displaystyle \lim_{n \to \infty} \left[ (z_{1})^{z_{1}} \dots (z_{n})^{z_{n}} \right] = 0 \]
(1) Compute the limit
\[ \displaystyle \lim_{n \to \infty} \left[ i^{i} (2i)^{2i} \dots (ni)^{ni} \right] \]
(2) Consider the sequence \( (z_{n})_{n \in \mathbb{N}} \) of complex numbers defined by \( z_{n} = \frac{i}{n} \). Show that
\[ \displaystyle \lim_{n \to \infty} \left[ (z_{1})^{z_{1}} \dots (z_{n})^{z_{n}} \right] = 0 \]