Complex variables questions, limits and bounds

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SUMMARY

The discussion centers on the concept of boundedness in complex functions, specifically when evaluating limits as z approaches infinity. It is established that a function f(z) can have a finite limit at infinity without being bounded. The example provided, where \(\lim_{z \to \infty} \frac{1}{z} = 0\), illustrates that while the limit is finite, the function f(z) = 1/z is not bounded since it approaches infinity as z approaches 0. This clarifies the distinction between having a finite limit and being bounded.

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If I have a function f(z) such that limit z --> infinity is finite what do I know about that function?

Is it "bounded" or am I still confused about what "bounded" means?
 
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Bounded means that |f(z)| stays less than some finite value B for ALL z. So, no. For example,

\lim_{z->\infty} \frac{1}{z} = 0

but f(z)=1/z is not bounded (it blows up at z=0).
 
Okay. That makes sense.
 

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