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I need to insert into a table cell a formula that requires the summation sign and I apparently do something wrong and the compiler just throws me back errors and I really don't know how to solve this.

\begin{tabular}{ c || c c c }
Linea & Costo & Esecuzioni & Totale \\ \hline                        
1 & $1$ & $1$ & $1$ \\
2 & $n+1$ & $2$ & $2(n+1)$ \\
3 & \begin{equation} \sum_{n=1}\nolimits' C_n \end{equation} & $2$ & $2(n+1)$ \\
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up vote 4 down vote accepted

You cannot use \begin{equation}...\end{equation} inside a table cell. If you want it to look like a displayed equation, you can do this:

3 & \(\displaystyle \sum_{n=1}\nolimits' C_n \) & $2$ & $2(n+1)$ \\

Here, \( ... \) is inline math (more-or-less equivalent to $ ... $), and \displaystyle is self-explanatory: it typesets the equation in the style as it was a displayed math.

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What if you want the equation numbering? – Raffi Khatchadourian Mar 24 at 15:27
If you want a numbered equatiob insid a table, you do something wrong. – yo' Mar 24 at 18:58

You can actually put \begin{equation}...\end{equation} in a tabular cell, but you need to box it up first, either using a vbox, minipage, parbox, or something similar.

Whether or not that's a good idea is another issue; if your tabular is floating then it's almost certainly a bad idea (as the numbering might get messed up)

3 & \vbox{\begin{equation} \sum_{n=1}\nolimits' C_n \end{equation}} & $2$ & $2(n+1)$ \\
4 & \parbox{3cm}{\begin{equation} \sum_{n=1}\nolimits' C_n \end{equation}} & $2$ & $2(n+1)$ \\
5 & \begin{minipage}{4cm}\begin{equation} \sum_{n=1}\nolimits' C_n \end{equation}\end{minipage} & $2$ & $2(n+1)$ \\
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how do I know if my tabular is floating? (sorry for this basic question, but I'm a rookie and I'm learning by doing...) – haunted85 Oct 10 '12 at 16:57
@haunted85 if it's in a table environment. have a look at the not so short guide to latex – cmhughes Oct 10 '12 at 18:25
But how do I know what size to give it? I am not specifying a fixed size in \begin{tabular}. – Raffi Khatchadourian Mar 25 at 15:54

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