Suppose U solves the heat equation on the real lineUt = 4Uxx, x ∈ Rwith initial valueU(x, 0) = (4, x ≤ 02, x > 0.(i) Use the Fourier-Poisson formula to give an explicit expression for the solutionU.(ii) Describe the qualitative behaviour of U in this case as t → ∞ and plot outthe solution at several instants of time to explain your answer. What is the limitof U as t → ∞?

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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Suppose U solves the heat equation on the real line
Ut = 4Uxx, x ∈ R
with initial value
U(x, 0) = (
4, x ≤ 0
2, x > 0.
(i) Use the Fourier-Poisson formula to give an explicit expression for the solution
U.
(ii) Describe the qualitative behaviour of U in this case as t → ∞ and plot out
the solution at several instants of time to explain your answer. What is the limit
of U as t → ∞? 

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