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If-z-C-such-that-R-z-n-gt-0-for-n-N-Show-that-z-R-




Question Number 58193 by PDF1104_ last updated on 19/Apr/19
If z ∈ C  such that R(z^n )>0 for n∈N^+ .  Show that z ∈R^+ .
$$\mathrm{If}\:{z}\:\in\:\mathbb{C}\:\:\mathrm{such}\:\mathrm{that}\:\mathfrak{R}\left({z}^{{n}} \right)>\mathrm{0}\:\mathrm{for}\:{n}\in\mathbb{N}^{+} . \\ $$$$\mathrm{Show}\:\mathrm{that}\:{z}\:\in\mathbb{R}^{+} . \\ $$

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