One of the basic vector identities is(adsbygoogle = window.adsbygoogle || []).push({});

[itex] \nabla \cdot (\nabla f \times \nabla g) = 0 [/itex]

Is this true if [itex]f[/itex] and [itex]g[/itex] are [itex] C^{1} [/itex] ? (Or they must be [itex]C^{2} [/itex] functions?

Thanks!

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# Vector identity

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