Math & Science ⇒ Bracket Size and Rendering

[feynman44]

I have two questions about the following:

det.JPG (18.26 KiB) Viewed 2855 times

1) How can I make the determinant lines slightly larger? I've tried \Biggl| but this still isn't big enough.

2) When viewed at certain zoom levels, there are small white gaps in the matrix's brackets (as in the above screenshot). I'm sure it would print correctly, but this can be annoying when viewing the file as a PDF. Is there any way to fix this rendering issue?

Here is my code. Thanks!

Code: Select all

\documentclass{article}
\usepackage{amsmath}
\begin{document}

\begin{equation*}
\left|\left[
{\begin{array}{cccc}
4&-3&8&-10\\
0&-1&9&-9\\
6&-6&-5&-7\\
-2&-2&3&-7\\
\end{array}}
\right]^{-1} \!-\,3\text{I}_4 \; \right|
\end{equation*}

\end{document}

[Frits]

About the square brackets: Viewing the PDF in a different viewer will probably already give different results. Also, changing the font used can influence this. An earlier topic on something similar can be found here.

Can't help you with the determinant symbol unfortunately, maybe you can try to increase the font size of just those brackets (with the fix-cm package)?

[feynman44]

Thanks for the reply - the bracket problem is still present when I view the published PDF in Adobe Reader, but as long as it prints fine I guess I'll live with it.

I solved my other problem using \vphantom:

Code: Select all

\begin{equation*}
\left|\left[
{\begin{array}{cccc}
4&-3&8&-10\\
0&-1&9&-9\\
6&-6&-5&-7\\
-2&-2&3&-7\\
\end{array}}
\right]^{-1}
\vphantom{\rule[-2.8em]{0pt}{2.8em}}
\!-\,3\text{I}_4 \; \right|
\end{equation*}