Find the radius of convergence of the following series.
i)
ii)
For a power series (\sum a_k (z-z_0)^k), the radius of convergence (R) is given by [ \frac{1}{R}=\limsup_{k\to\infty}|a_k|^{1/k}. ] i) The given series is ____ ________ ____ __________ _________.
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___ ______ ________ _________ __________ ________ _________ ___.
_____ __________ ________ _____ ______ ____ _________.
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Evaluate , where c is the eight like figure shown in Fig. 1.
a) If is entire such that
in
then show that f has the form
where
are constants with
.
Find all solutions to the equation .
Determine whether each of the following statement is true or false. Justify your answer with a short proof or a counter example.
i) If , where a and b are integers, then
if a > 0.
ii) If f(z) and are analytic functions in a domain, then f is necessarily a constant.
iii) A real-valued function u(x, y) is harmonic in D iff u(x, -y) is harmonic in D.
iv) .
v) The inequality holds for
.
vi) If has the property that
converges, then f is necessarily an entire function.
vii) If a power series converges for |z| < 1 and if
is such that |bn| < n2 |an| for all
, then
converges for |z| < 1.
viii) If f is entire and for all z, then there exists an entire function g such that
for all
.
ix) A mobius transformation which maps the upper half plane onto itself and fixing
and no other points, must be of the form
for some
and
.
x) If f is entire and is bounded as
, then f is constant.
Find the points where the function is not analytic.
Find the zeros and singularities of the function in
. Also find the residue at the poles.
Show that there is only one linear fractional transformation that maps three given distinct points z1, z2 and z3 in the extended z plane onto three specified distinct points w1, w2 and w3 in the extended w plane.