(adsbygoogle = window.adsbygoogle || []).push({}); Question about "del"

We know that A x (BxC)= (A·C)B-(A·B)C (*)

In the following example, we can treat ∇ as a vector and apply the formula (*) above to get the correct answer

∇x(∇xV)= ∇(∇·V)-∇^2 V

But in this example, the formula (*) seems to fail

∇x(UxV)≠U(∇·V)-V(∇·U)

Why?

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Question about del

**Physics Forums | Science Articles, Homework Help, Discussion**