Discussion
Which of the following is NOT a valid vector operation?
Answer: A
Correct answer: the divergence of a scalar
Divergence takes a vector and returns a scalar, so it has nothing to operate on when given a scalar. The valid operations are gradient on a scalar, and divergence and curl on a vector - and the Laplacian, which is the divergence of a gradient and so applies to a scalar by way of a vector.
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