- #1
AxiomOfChoice
- 533
- 1
How do I make sense of the index notation expression
[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.)
[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.)