Problems and Solutions for Partial Di erential Equations
Problems and Solutions for Partial Differential Equations
by Willi-Hans Steeb International School for Scientific Computing at University of Johannesburg, South Africa
Yorick Hardy Department of Mathematical Sciences at University of South Africa, South Africa
Contents
1 Linear Partial Differential Equations
1
2 Nonlinear Partial Differential Equations
26
3 Lie Symmetry Methods
109
Bibliography
133
Index
134
vi
Chapter 1
Linear Partial Differential Equations
Problem 1. equation
is given by
Show that the fundamental solution of the drift diffusion
u 2u u
t
=
x2
+2 x
u(x, t) = exp - 1 (x - x0 + 2t)2 .
4t
4t
Solution 1.
Problem 2. (i) Show that
Dxm(f
?
1)
=
mf xm .
(1)
(ii) Show that
Dxm(f ? g) = (-1)mDxm(g ? f ).
(2)
(iii) Show that
Dxm(f ? f ) = 0, for m odd
(3)
Solution 2. 1
................
................
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