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December 19th, 2017, 09:28 AM   #1
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Operator Fundamental solution

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December 21st, 2017, 06:56 AM   #2
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If $x> \xi$ then $|x- \xi|= x- \xi$ and $\frac{d^2|x-\xi|}{dx}= \frac{d^2(x- \xi)}{dx}= 0$. If $x< \xi$ then $|x- \xi|= -x+ \xi$ and $\frac{d^2|x-\xi|}{dx}= \frac{d^2(-x+\xi)}{dx}= 0$. The derivative, and so the second derivative, is not defined at $x= \xi$.

Now, what is the definition of "fundamental solution"?

Last edited by Country Boy; December 21st, 2017 at 06:59 AM.
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