8. (Liouville's theorem, Cauchy estimates and the maximum modulus principle) (a) Suppose that f is entire, and that for some positive integer k and some constants C,r > 0 it holds that IS(2)| < C\zl*. 1=| 2r. Show that f is a polynomial of degree at most k. (b) Let f and g be analytic in |2| < 1. Suppose also that they have no zeros there, and that IS(=)| = [g(2)| on |z| = 1. Show that there is a constant a with |a| = 1 such that f(2) = ag(2).

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8. (Liouville's theorem, Cauchy estimates and the maximum modulus principle)
(a) Suppose that f is entire, and that for some positive integer k and some constants C,r > 0 it
holds that
IS(2)| < C|zl*,
|=|2r.
Show that f is a polynomial of degree at most k.
(b) Let f and g be analytic in |2| < 1. Suppose also that they have no zeros there, and that
IS(:)| = \g(2)| on |z| = 1. Show that there is a constant a with |a| = 1 such that f(2) = ag(2).
Transcribed Image Text:8. (Liouville's theorem, Cauchy estimates and the maximum modulus principle) (a) Suppose that f is entire, and that for some positive integer k and some constants C,r > 0 it holds that IS(2)| < C|zl*, |=|2r. Show that f is a polynomial of degree at most k. (b) Let f and g be analytic in |2| < 1. Suppose also that they have no zeros there, and that IS(:)| = \g(2)| on |z| = 1. Show that there is a constant a with |a| = 1 such that f(2) = ag(2).
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