- #1

- 533

- 1

[tex]

r_j r_i p_j

[/tex]

?

What I really *want* it to be is

[tex]

\vec{r} (\vec{r} \cdot \vec{p})

[/tex]

And it turns into this, as long as I can commute the [itex]r_i[/tex] and [itex]r_j[/itex]...right?

(By the way, here [itex]\vec{r}[/itex] is just the position vector and [itex]\vec{p}[/itex] is the momentum vector.)