S.O.S. Mathematics CyberBoard

[meks08]

Let F: U ⊆ R^3 →R^3 be a vector field of class C^2. Show that div (curl F) = 0.

I need help with this problem.

Thanks

[Shadow]

What have you tried? This can be proven directly.
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[meks08]

I just don't understand it. I've been somewhat lost in my Calc III class lately. I don't need it solved but could you tell me how I need to solve this or point me to some other outside resource that would help me understand this?

Thanks

[Shadow]

[url=en.wikipedia.org]wikipedia[/url] is a good place.
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