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# latex problem watch

1. why will the following code not print properly

\begin{align}
\theta_0 &= L^{-2}e^{-2a} \left( \left( \dot{a} P_{\text{sym}} + a' U_{\text{sym}} - \dot{P_{\text{sym}}} - P_{\text{sym}}{}^2 + \left( \star P \right) \left[ \epsilon, P \right] \right) \omega^0 \nonumber &+ \left( a'P_{\text{sym}} + \dot{a} U_{\text{sym}} - P_{\text{sym}}{}'-P_{\text{sym}}U_{\text{sym}} + \left( \star U \right) \left[ \epsilon, P \right] \right) \omega^1 \right) \wedge \omega
\end{align}

i have a feeling its because i split it over two lines and then the brackets dont match up but ive been staring at it for about an hour now and can't see the problem
2. (Original post by latentcorpse)
why will the following code not print properly

\begin{align}
\theta_0 &= L^{-2}e^{-2a} \left( \left( \dot{a} P_{\text{sym}} + a' U_{\text{sym}} - \dot{P_{\text{sym}}} - P_{\text{sym}}{}^2 + \left( \star P \right) \left[ \epsilon, P \right] \right) \omega^0 \nonumber &+ \left( a'P_{\text{sym}} + \dot{a} U_{\text{sym}} - P_{\text{sym}}{}'-P_{\text{sym}}U_{\text{sym}} + \left( \star U \right) \left[ \epsilon, P \right] \right) \omega^1 \right) \wedge \omega
\end{align}

i have a feeling its because i split it over two lines and then the brackets dont match up but ive been staring at it for about an hour now and can't see the problem
Which software are you inputting this into?

And that double-bracket I've put in bold,. is it meant to be there?
3. (was expecting a thread on condoms... or gloves)
4. (Original post by latentcorpse)
why will the following code not print properly

\begin{align}
\theta_0 &= L^{-2}e^{-2a} \left( \left( \dot{a} P_{\text{sym}} + a' U_{\text{sym}} - \dot{P_{\text{sym}}} - P_{\text{sym}}{}^2 + \left( \star P \right) \left[ \epsilon, P \right] \right) \omega^0 \nonumber &+ \left( a'P_{\text{sym}} + \dot{a} U_{\text{sym}} - P_{\text{sym}}{}'-P_{\text{sym}}U_{\text{sym}} + \left( \star U \right) \left[ \epsilon, P \right] \right) \omega^1 \right) \wedge \omega
\end{align}

i have a feeling its because i split it over two lines and then the brackets dont match up but ive been staring at it for about an hour now and can't see the problem
You are correct it is due to the splitting of brackets across multiple lines. I don't have latex on this pc so I cant test this to make sure it displays but try this.

\begin{align}
\theta_0 &= L^{-2}e^{-2a} \left( \left( \dot{a} P_{\text{sym}} + a' U_{\text{sym}} - \dot{P_{\text{sym}}} - P_{\text{sym}}{}^2 + \left( \star P \right) \left[ \epsilon, P \right] \right) \omega^0
\right).
\nonumber \\ &+
\left(.
\left( a'P_{\text{sym}} + \dot{a} U_{\text{sym}} - P_{\text{sym}}{}'-P_{\text{sym}}U_{\text{sym}} + \left( \star U \right) \left[ \epsilon, P \right] \right) \omega^1 \right) \wedge \omega
\end{align}

Note in your original you weren't telling latex to break the line anywhere so I've inserted \\ and just before and after I've added \right). and \left(. these are dud brackets that trick it into doing what you want.

Hope it works, if not let me know
5. double bracket is meant to be there. it's to space the superscript to the right of the subscript

i.e. not
6. (Original post by Mathematician!)
Which software are you inputting this into?
Presumably the LaTeX IDE...

Have you tried the Binary Mountain approach? Take out half of the code, if it works, then you've removed the bit that's broken. If not, then you're left with the half that's broken. Go through a second iteration, then a third, until you get down to the bit that's causing your problem
7. well the \left(. and \right). got rid of all the errors but they don't appear to be "dud" - they are showing up in the pdf display
8. Try just inserting \left. \right.
9. ok the \left and \right thing has solved that.

now the only problem is that the brackets don't match up in sizes before and after the line split even though i used \left( and \right)
10. That's to be expected; not much you can really do about it unless you switch to manual sizing.

(Original post by latentcorpse)
double bracket is meant to be there. it's to space the superscript to the right of the subscript

i.e. not
You can do this in a slightly nicer way: .
11. cheers for the P^2 thing.

i've got it to display nice but i'm still getting 28 errors when i run and they're all apparently related to missing brackets and stuff but i just can't find them
here's my code:

\begin{align}
\theta^0{}_1 &= L^{-2}e^{-2a} \left \{ \left( a'' - \ddot{a} \right) \omega^0 \wedge \omega^1 - \left( \star \left[ P_{\text{sym}}, U_{\text{sym}} \right] \right) \omega^2 \wedge \omega^3 \right \} \\
\theta_0 &= L^{-2}e^{-2a} \biggl\{ \biggl( \dot{a} P_{\text{sym}} + a' U_{\text{sym}} - \dot{P}_{\text{sym}} - {P_{\text{sym}}}^2 + \left( \star P \right) \left[ \epsilon, P \right] \biggr) \omega^0 \right \\ \nonumber &+ \biggl( a'P_{\text{sym}} + \dot{a} U_{\text{sym}} - {P_{\text{sym}}}'-P_{\text{sym}}U_{\text{sym}} + \left( \star U \right) \left[ \epsilon, P \right] \biggr) \omega^1 \biggr\} \wedge \omega \\
\theta_1 &= L^{-2}e^{-2a} \biggl\{ \biggl( a' U_{\text{sym}} + \dot{a} P_{\text{sym}} - {U_{\text{sym}}}' - {U_{\text{sym}}}^2 + \left( \star \right) \left[ \epsilon, U \right] \biggr) \omega^1 \right \\ \nonumber &+ \left \biggl( \dot{a} U_{\text{sym}} + a'P_{\text{sym}} - \dot{U}_{\text{sym}} - U_{\text{sym}}P_{\text{sym}} + \left( \star P \right) \left[ \epsilon, U \right] \biggr) \omega^0 \biggr\} \wedge \omega \\
\theta &= L^{-2}e^{-2a} \left( \left[ U, P \right]_{\text{asym}} \omega^0 \wedge \omega^1 + \left( \text{det} U_{\text{sym}} - \text{det} P_{\text{sym}} \right) \omega \wedge \omega \right)
\end{align}

and the display:

doesn't work here. but it does on TeXnicCenter which is what i'm using.

thanks for any help.

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