Let a function f be continuous on a closed bounded region R, and let it be analytic and not constant throughout the interior of R. Assuming that f(z) # 0 anywnere n R, prove that [f(z)| has a minimum value m in R which occurs on the boundary of R and never in the interior ofR by applying the Maximum Modulus Principle to the function 1/f(z). 2.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter9: Systems Of Equations And Inequalities
Section: Chapter Questions
Problem 12T
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Question 2
1.
Supply all the details of the proof of Gauss's Mean Value Theorem:
If f is analytic in a simply connected domain D that contains the circle Cr ,
1 27
centered at zo with radius R, then f(zo) =-
+ Re" )d0.
2л
2.
Let a function ƒ be continuous on a closed bounded region R, and let it be analytie
and not constant throughout the interior of R. Assuming that f(z) ± 0 anywhere in
R, prove that [(z)| has a minimum value m in R which occurs on the boundary of R
and never in the interior ofR by applying the Maximum Modulus Principle to the
function 1/f(z).
3.
Find the sum of the series.
00
1+i
8.
1
(a)
(b)
Σ
2
n=0
n=2 (2+i)"
iz
z"
Σ
and the definition sin(z)=
eiz
4.
Use the Maclaurin series e?
n=0 n!
to find the Maclaurin series for the entire function f(z) = sin(z).
2i
Differentiate the Maclaurin series for f(z) = sin(z) term by term to obtain the
Maclaurin series for f (z) = cos(z).
5.
6.
Derive the Taylor series representation in the disk |z - i|< /2 :
1
(z-i)"
Σ
n=0 (1-i)"+1
1-z
1
1
Hint: Start by writing
1-z
1
%3D
%3D
(1- i) - (z - i) 1-i 1-(z-i)/(1- i)
203
Transcribed Image Text:1. Supply all the details of the proof of Gauss's Mean Value Theorem: If f is analytic in a simply connected domain D that contains the circle Cr , 1 27 centered at zo with radius R, then f(zo) =- + Re" )d0. 2л 2. Let a function ƒ be continuous on a closed bounded region R, and let it be analytie and not constant throughout the interior of R. Assuming that f(z) ± 0 anywhere in R, prove that [(z)| has a minimum value m in R which occurs on the boundary of R and never in the interior ofR by applying the Maximum Modulus Principle to the function 1/f(z). 3. Find the sum of the series. 00 1+i 8. 1 (a) (b) Σ 2 n=0 n=2 (2+i)" iz z" Σ and the definition sin(z)= eiz 4. Use the Maclaurin series e? n=0 n! to find the Maclaurin series for the entire function f(z) = sin(z). 2i Differentiate the Maclaurin series for f(z) = sin(z) term by term to obtain the Maclaurin series for f (z) = cos(z). 5. 6. Derive the Taylor series representation in the disk |z - i|< /2 : 1 (z-i)" Σ n=0 (1-i)"+1 1-z 1 1 Hint: Start by writing 1-z 1 %3D %3D (1- i) - (z - i) 1-i 1-(z-i)/(1- i) 203
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