4. We have seen in lectures that the differentiation of a function given by valid power series expansion can be carried out termwisely on the power series. Now we turn to study the integration. Suppose that the radius of convergence of the power series f(2) = Lar(z – z0)* k=0 is R, R> 0. (a) Show that the power series ak F(2) = L+1= - z0)*+! k=0 is at least R and that F'(z) = f(z) for all z with |z – zo| < R.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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4.
We have seen in lectures that the differentiation of a function given
by valid power series expansion can be carried out termwisely on the power
series. Now we turn to study the integration. Suppose that the radius of
convergence of the power series
f(2) = ak(z – zo)*
k=0
is R, R> 0.
(a)
Show that the power series
z – z0)*+1
ak
F(2) = E;
k+1
k=0
is at least R and that F'(z) = f(z) for all z with |z – zo| < R.
Transcribed Image Text:4. We have seen in lectures that the differentiation of a function given by valid power series expansion can be carried out termwisely on the power series. Now we turn to study the integration. Suppose that the radius of convergence of the power series f(2) = ak(z – zo)* k=0 is R, R> 0. (a) Show that the power series z – z0)*+1 ak F(2) = E; k+1 k=0 is at least R and that F'(z) = f(z) for all z with |z – zo| < R.
(b)
Use the above consequence to show that
Log(1 – 2) = –
k=1
|2| < 1
where Log is the principle branch of logarithm function.
Transcribed Image Text:(b) Use the above consequence to show that Log(1 – 2) = – k=1 |2| < 1 where Log is the principle branch of logarithm function.
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