- #1

## Homework Statement

I need to prove

**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!

## Homework Equations

## The Attempt at a Solution

[/B]

I have attempted the solution but am not sure how it is possible to keep a kroneker delta on the right hand side.

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