# A bit larger spread between rows of a 2x2 table

The following is my expression:

$$\left[ \begin{tabular}{c|c} y & a_{bc} \\ \hline a_{ab}^T & y \end{tabular} \right].$$


Note that the part a_{ab}^T is very close to the hline. I would like to have a bit larger spacing, such that 'T' from the above example is clearly separated from the hline. I've tried using [pt], but it did not work. I'm using

\documentclass[a4paper,12pt]{book}

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–  Werner Jun 19 '12 at 17:30

Since you are in the math mode anyway, you can use the array environment to avoid the \$ pairs.

\documentclass[a4paper,12pt]{book}

\begin{document}
$$\left[ { \renewcommand*{\arraystretch}{1.5} \begin{array}{c|c} y & a_{bc} \\ \hline a_{ab}^T & y \end{array} } \right].$$

\end{document}


I would also recommend you to look at the mathtools package for more goodies regarding the matrix environments.

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One of most useful posts I have seen recently. Thanks a lot for pointing out mathtools package! –  Predrag Punosevac Jun 19 '12 at 17:33
@PredragPunosevac Thank you! But I'm merely harvesting the other great answers. –  percusse Jun 19 '12 at 20:21