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As I was working on my numerical PDEs homework, an identity came up which we used to solve a problem. I was able to answer the question, but my question here is where does the identity come from (I figured it has something to do with analysis) ?

The identity is

The integral of $$v^2$$ over some region D is equivalent to the integral of $$v^2\Delta \phi$$ over D, where $$\phi = \frac{1}{2d}|x|^2$$

I haven't taken an analysis class so not too sure where this comes from

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# Question about Identity

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