# Thread: Vector Triple Product, Alternating Tensor

1. It's a vector triple product:

$\mathbf{r}\cdot(\mathbf{\Phi}\times\mathbf{r}).$

And what do you know about $\mathbf{r}$ relative to $\mathbf{\Phi}\times\mathbf{r}?$

What does that tell you about the dot product in the vector triple product?

2. That they're orthogonal vectors?

3. Correct! So the dot product is...

4. Zero!

Haha honestly thank you so much for the help with this, I really appreciate it.

Think I'll just leave the second bit for now.....

Thanks again!

5. You're welcome!

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