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45 lines
1.1 KiB
TeX
45 lines
1.1 KiB
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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\usepackage{tikz}
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\usetikzlibrary{decorations.pathreplacing}
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\setlength\arraycolsep{4pt} % default value: 6pt
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\newcommand\tikzmark[1]{%
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\tikz[overlay,remember picture,baseline] \coordinate [anchor=base] (#1);}
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\newcommand\DrawBrace[3]{%
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\draw [decorate,decoration={brace,amplitude=2pt,mirror,raise=2pt}]
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(#1) -- (#2) node [black,midway,sloped,yshift=-10pt] {\footnotesize$#3$};
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}
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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}{*{9}{c}}
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\tikzmark{a}1 \\
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& \ddots & \\
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& & \tikzmark{b}1 \\
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& & & \tikzmark{c}-1 \\
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& & & & \ddots & \\
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& & & & & \tikzmark{d}-1\\
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& & & & & & \tikzmark{e}\phantom{-}0 \\
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& & & & & & & \ddots & \\
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& & & & & & & & \tikzmark{f}\phantom{-}0 \\
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\end{array}
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\right)
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\end{equation*}
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\begin{tikzpicture}[remember picture,overlay]
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\DrawBrace{a}{b}{r_{+}(s)-mal}
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\DrawBrace{c}{d}{r_{-}(s)-mal}
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\DrawBrace{e}{f}{r_{0}(s)-mal}
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\end{tikzpicture}
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\end{preview}
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\end{document}
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