Dear all:(adsbygoogle = window.adsbygoogle || []).push({});

I have met a equation called Eikonal equation which is a special case of Hamilton-Jacobi equation. It is writen as:

||[tex]\nabla[/tex]f(x)|| = P(x)

Could anybody explain what's the meaning of this function please? I have read it from Wiki and mathworld, but it doesn't make too much sense to me.

Thanks in advance.

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# Eikonal equation

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