I have a very long align*
with lots of \intertext
. Some of the equations are really long, like this:
What is the most sensible way to typeset this? So far I have always used the following:
&= \bra{\pi^-} \bra{\pi^-} \delta^{ab} \delta^{cd} \ket{\pi^+} \ket{\pi^+} A_s
\\&\quad
+ \bra{\pi^-} \bra{\pi^-} \delta^{ac} \delta^{bd} \ket{\pi^+} \ket{\pi^+} A_t
\\&\quad
+ \bra{\pi^-} \bra{\pi^-} \delta^{ad} \delta^{bc} \ket{\pi^+} \ket{\pi^+} A_u \,.
This seems to work, although I am not sure whether \quad
is really the right measure to shift it.
Now I have tried to use some nested thing:
&=
\begin{aligned}[t]
&\bra{\pi^-} \bra{\pi^-} \delta^{ab} \delta^{cd} \ket{\pi^+} \ket{\pi^+} A_s
\\
&+ \bra{\pi^-} \bra{\pi^-} \delta^{ac} \delta^{bd} \ket{\pi^+} \ket{\pi^+} A_t
\\
&+ \bra{\pi^-} \bra{\pi^-} \delta^{ad} \delta^{bc} \ket{\pi^+} \ket{\pi^+} A_u \,.
\end{aligned}
That looks like this now:
Only with {aligned}[t]
I got it to look correct. Without the [t]
the equal-sign would be in the middle. With a simple gathered
the three lines would be centered, that looked really weird:
The aligned
seems to be a bit more typing. However, the semantics in the LaTeX code seem more clear and the output seems to be a bit more consistent, the +
pretty accurately under the \langle
. The spacing between =
and \langle
in the first line got a bit larger, that is probably a bad thing.
Is there a good way to do this?
=
sign. There are various other possibilities. Could we know the l.h.s.,so we can test?.