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