Using Liouville's Theorem to Show f is Constant

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SUMMARY

The discussion centers on applying Liouville's Theorem to demonstrate that an entire function f, which satisfies the periodic conditions f(z) = f(z + 2π) and f(z) = f(z + 2πi) for all z in C, must be constant. The periodicity implies that f is completely determined by its values within a square of side length 2π. To utilize Liouville's Theorem effectively, it is essential to establish that f is bounded within this square, thereby confirming that f is constant across the complex plane.

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  • Understanding of entire functions and their properties
  • Familiarity with Liouville's Theorem
  • Knowledge of periodic functions in complex analysis
  • Basic concepts of complex mapping and boundedness
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smoothman
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Suppose f is an entire function such that [itex]f(z) = f(z+2\pi)[/itex]
and [itex]f(z)=f(z+2\pi i)[/itex] for all z [itex]\epsilon[/itex] C. How can you use Liouville's theorem to show f is constant..

any help on that please to get me started off.. thnx a lot :)
 
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The two given relations tell you that [tex]f[/tex] is completely determined by its values in a square of side length [tex]2\pi[/tex]... what do you need to show about [tex]f[/tex] to use Liouville? Can you get it from this info now?
 
not just completely determined, but actually that it maps that square onto its range of values.
 

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