- #1

OP warned about not using the homework template

I need to prove

where I have used . as the dot product, {} as subscript. Thank you!

**B**.(**Gradient**.**B**) -**B**X(**Gradient**X**B**)=Del{i} [**B**{i}**B**{j} -1/2 (kroneker delta {ij}**B**^2]where I have used . as the dot product, {} as subscript. Thank you!