Chaves com duas linhas - Expressão matemática
Allef Pablo Araujo
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Marco Paulo (GMail)
Um exemplo simples:
\documentclass{article}
\usepackage{amsmath}
\begin{document}
$
a_{ij} =
\begin{cases}
1, & \mbox{se } v_i \mbox{e } v_j \mbox{são adjacentes;} \\
0, & \mbox{caso contrário.}
\end{cases}
$
\end{document}
Retirado aqui: https://kogler.wordpress.com/2008/03/21/latex-multiline-equations-systems-and-matrices/
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Allef Pablo Araujo
Misplaced alignment tab character &.
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Marco Paulo (GMail)
Qual sistema vc está usando?
Mande um exemplo mínimo para que possamos tentar reproduzir o erro.
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Allef Pablo Araujo
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Marco Paulo (GMail)
Vc só não incluiu o pacote necessário para utilizar o código.
\usepackage{amsmath}
Inclua essa linha no preambulo que vai funcionar.
Marco Paulo
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Allef Pablo Araujo
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