Special characters in the header of the LaTeX table

Question

When I include \overline{x}or other special characters in the table heading text, all the subtitle text will not be displayed at all. When I put plain text without special characters, the signature works fine. How to include special characters in the title?

Answer 1

Do you bet $ around math? I.e:.

\caption{This is a caption with maths $\overline{x}$ in it.}

Answer 2

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\documentclass{article}
\begin{document}
It seems \sqrt{2} I forgot some dollar signs.
\end{document}

TeX

! Missing $ inserted.
<inserted text> 
                $
l.3 It seems \sqrt{
                   2} I forgot some dollar signs.
? 

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