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- \documentclass{article}
- \usepackage[pdftex,active,tightpage]{preview}
- \setlength\PreviewBorder{2mm}
- \usepackage{amsmath,array}
- \renewcommand\arraycolsep{4pt} % default value: 6pt
- \begin{document}
- \begin{preview}
- \begin{equation*}
- \left( \,
- \begin{array}{r@{}r@{}r r r} % @{} is used twice to suppress intercolumn whitespace
- \overbrace{
- \boxed{
- \begin{array}{rrr} % First block (1)
- 1 & & \\
- & \ddots & \\
- & & 1 \\
- \end{array}
- }
- }^{r_+(s)-mal} \\
- &
- \underbrace{
- \boxed{
- \begin{array}{rrr} % Second block (-1)
- -1 & & \\
- & \ddots & \\
- & & -1\\
- \end{array}
- }
- }_{r_{-}(s)-mal} \\
- & &
- \underbrace{
- \boxed{
- \begin{array}{rrr} % Third block
- 0 & & \\
- & \ddots & \\
- & & 0\\
- \end{array}
- }
- }_{r_0(s)-mal} \\
- \end{array}\,\right)
- \end{equation*}
- \end{preview}
- \end{document}
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