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I have a slightly complex, long section of equations in my latex document, but from what I can see I think it is programmed correctly. When I compile the document, I get the error

"./ThesisDraft1.tex:111: Display math should end with $$. ^ l.111 ...dD}{dt} = \frac{\Gamma \times A}{x$^{2}$}"

The error starts at the first line of the equation, and if I comment out that line, moves to the second line of the equation and crashes, etc. I have tried commenting out the entire equation block and the document compiles with no problem, so I know it's a problem with this equation block. I have another equation earlier in the document, but that compiles with no problem.

Here is the code block:

   \begin{displaymath}
   \frac{dD}{dt} = \frac{\Gamma \times A}{x$^{2}$}
   dD = \frac{\Gamma \times A}{$x^{2}$}dt
   \int{dD} = \int_0^21hrs  \frac{\Gamma \times A}{x$^{2}$}dt 
   \int{dD} = \frac{\Gamma}{$x^{2}$} \int_0^21hrs A dt = \frac{\Gamma \times A$_{0}$}                       {x$^{2}$} \int_0^21hrs exp$^{-\delta t}$ dt
   \end{displaymath}

Any ideas are greatly appreciated!

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closed as off-topic by cmhughes, ChrisS, dustin, Christian Hupfer, moewe May 8 at 5:25

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4  
remove the $ you are already in math mode –  David Carlisle May 8 at 0:46
1  
Welcome to TeX.SE. Also, not sure about the 0^21hrs. Is that intended to be 0^{2} 1hrs, or 0^{21} hrs, or something else? –  Peter Grill May 8 at 1:26
    
Thanks David, that worked! Any idea how I can close out this question? –  katrijnn May 8 at 2:21
4  
This question appears to be off-topic because it has been resolved in the comments by removing the superfluous $ –  cmhughes May 8 at 3:51