Question 11

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Question 11
8.
Let Cj denote the positively oriented boundary of the square whose sides lie along
the lines x=±l_and v= +1 and let C be the positively oriented circle |z| = 4, as
shown below. Explain why
1
dz =
+1
dz
2z2
C.
2z2 +1
C2
9.
Let C be the positively oriented circle centered at the point zo with radius r>0.
Use a parametrization of C to show that
dz
= 27i
10.
Let C denote the positively oriented circle |z| = 1. Show that
cos(z)
2 sin(z)
Ti
dz =
4
- ni
a)
dz =
b)
4z + T
C
c z(z +8)
11.
Let C denote the positively oriented circle z - i = 2. Evaluate the integrals:
b)
e
a)
3
+ 2z
dz
dz
č (z - 1)
CZ +4
Suppose that fAz) is entire and that the harmonic function u(x, y) = Re[f(z)] has an
upper bound uo; that is, u(x, y) <uo for all points (x, y) in the xy-plane. Show that
u(x, y) must be constant throughout the plane by applying Liouville's theorem to
the function g(z) = exp[f{z)].
12.
Transcribed Image Text:8. Let Cj denote the positively oriented boundary of the square whose sides lie along the lines x=±l_and v= +1 and let C be the positively oriented circle |z| = 4, as shown below. Explain why 1 dz = +1 dz 2z2 C. 2z2 +1 C2 9. Let C be the positively oriented circle centered at the point zo with radius r>0. Use a parametrization of C to show that dz = 27i 10. Let C denote the positively oriented circle |z| = 1. Show that cos(z) 2 sin(z) Ti dz = 4 - ni a) dz = b) 4z + T C c z(z +8) 11. Let C denote the positively oriented circle z - i = 2. Evaluate the integrals: b) e a) 3 + 2z dz dz č (z - 1) CZ +4 Suppose that fAz) is entire and that the harmonic function u(x, y) = Re[f(z)] has an upper bound uo; that is, u(x, y) <uo for all points (x, y) in the xy-plane. Show that u(x, y) must be constant throughout the plane by applying Liouville's theorem to the function g(z) = exp[f{z)]. 12.
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