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I have scoured my code and tried it out without the alignment. There is nothing i can see wrong with the code, but when I try to use align or eqnarray, I always get some error message. Here's the code

\oint_{|\zeta| &= \hat{R_2}} \frac{f(\zeta)}{\zeta - z} d\zeta \\ 
           &= \oint \frac{f(\zeta)}{\zeta} \frac{1}{1 - \frac{z}{\zeta}}    
&= \oint \frac{f(\zeta)}{\zeta} \frac{1}{1 - \frac{z}  
{\zeta}} d\zeta \\      
&= \oint \frac{f(\zeta)}{\zeta} \cdot \left( 1 +   
\frac{z}{\zeta} + \frac{z^2}{\zeta^2} + \cdots \right)  d\zeta \\
&= \oint \frac{f(\zeta)}{\zeta} d\zeta + \oint \frac{f(\zeta)} 
{\zeta^2} z d\zeta + \oint \frac{f(\zeta)}{\zeta^3} z^2 d\zeta

And here's the error message:

home/username/Dropbox/Math 132/.2013-07-01.tex.swp:105: Missing } inserted.   

<inserted text> 
l.105 \end{align*}

/home/username/Dropbox/Math 132/.2013-07-01.tex.swp:105: ==> Fatal error occurred,

Thank you !

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You have a & in the subscript of \oint. That doesn’t belong there. – Qrrbrbirlbel Jul 1 '13 at 19:53

2 Answers 2

your first line should be:

\oint_{|\zeta|} &= \hat{R_2} \frac{f(\zeta)}{\zeta - z} d\zeta \\ 

and maybe that \oint\limits_ looks nicer

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So the missing } was at the beginning, good catch and thank you so much! – user64742 Jul 1 '13 at 21:09



      \oint_{|\zeta|} &= \hat{R_2} \frac{f(\zeta)}{\zeta - z} d\zeta \\ 
                        &= \oint \frac{f(\zeta)}{\zeta} \frac{1}{1 - \frac{z}{\zeta}}  d\zeta\\             
                        &= \oint \frac{f(\zeta)}{\zeta} \frac{1}{1 - \frac{z} {\zeta}} d\zeta \\      
                        &= \oint \frac{f(\zeta)}{\zeta} \cdot \left( 1 + \frac{z}{\zeta} + \frac{z^2}{\zeta^2} + \cdots \right)  d\zeta \\
                        &= \oint \frac{f(\zeta)}{\zeta} d\zeta + \oint \frac{f(\zeta)} {\zeta^2} z d\zeta + \oint \frac{f(\zeta)}{\zeta^3} z^2 d\zeta


enter image description here

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Please don't post only code without any explaining text. – Martin Scharrer Jul 1 '13 at 20:18

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