Existence of Limit of [(x+iy)/(x-iy)]^n

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SUMMARY

The limit of the expression \(\lim_{n\rightarrow\infty}\left(\frac{z}{\overline{z}}\right)^n\) exists based on the modulus of \(z\). Specifically, if \(|z| < 1\), the limit approaches 0; if \(|z| = 1\), the limit oscillates and does not exist; and if \(|z| > 1\), the limit diverges to infinity. The analysis shows that the existence of the limit is contingent upon the value of \(z\) rather than the exponent \(n\).

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Homework Statement



For what values does the limit exist?
[tex]Lim_{n\rightarrow}\infty[/tex]([tex]\frac{z}{z conjugate}[/tex])^n

Homework Equations





The Attempt at a Solution


[(x+iy)/(x-iy)]^n
I just don't know how to tell when it exists. For even values of n because then there would be no sign changes?
 
Last edited:
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It should be obvious that the existence or non-existence of the limit depends on z (alternatively, x and y) not on n, since n is the argument for the limit (aside: is there a name for that?)
 

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