I'm very new to Latex. So i want to put a \bar W in a table but the bar is covered by the horizontal line of table.So it becomes invisible. I tried adding \noalign{\smallskip} after \hline but it cuts the vertical line of the table. Any suggestion?
Here is the code:
\begin{center}
\begin{tabular}{ | l | l |}
\hline
$\bar W $ & $A$ \\ \hline \noalign{\smallskip}
$\bar W $ & $A$ \\ \hline
... & ... \\ \hline
\end{tabular}
\end{center}
First bar is invisible and second one cuts the table.

\rule{0pt}{1em}is high enough to expose the\bar. It's a zero-width rule of height1em. There are other ways as well, most of which are contained in Column padding in tables. – Werner May 03 '13 at 16:51