Module 15 :  Vector fields, Gradient, Divergence and Curl
Lecture 44 :  Gradient Divergence and Curl [Section 44.1]
44.1.13 Theorem:
  Let be continuously differentiable vector-fields and a continuously differentiable vector-fields. Then the following hold:
(i)
(ii)
(iii)
where
 

and

  Proof
(i)
(ii)
 
                                                                                                                                  
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