Let f (z ) be an entire function. Suppose there exists a nonnegative integer n and a positive number R0 such that: | f(z) | ≤ c|z|^n , in the region |z| > R0 . Then f(z) is a polynomial of degree not exceeding n.
2. Use the generalized Liouville’s Theorem from (1) to prove the standard Liouville’s Theorem : If a function f is entire and bounded in the complex plane, then f(z) is constant througout the plane.
Please help me to prove these 2 theorem!!! Any help will be appreciated!!! Thank you so much!!!
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Verified answer
The second result follows easily from the first.
Take n = 0. Then |f(z)| <= c so f(z) is a polynomial
of degree 0, so f is constant.
You can find a proof of the first result at
http://en.wikipedia.org/wiki/Liouville%27s_theorem...
It uses Cauchy's integral formula and Taylor series.