APM346-2022S > Chapter 2

Text Book 2.4 Example 2.1


Yifei Hu:
In this problem, $-1 < t < -\infty$, when applying D' Alembert's formula, why we integrate from 0 to t instead of from -1 to t?
Thanks in advance!

Victor Ivrii:
We integrate from $t=0$ because for $t=0$ initial conditions are done. $-1<t $ is a domain where $f(x,t)$ is defined


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