"Illegal character in array arg"?
2,729
Your code works in the following way (see Troy's comment)
\documentclass{article}
\begin{document}
\[
\left\{
\begin{array}{l} % not \begin{array}{11}
\frac{x^2+2x}{x+1} \geq 0 \\
x > -1 \\
\end{array}
\right.
\]
\end{document}
but it is better:
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\[
\left\{
\begin{aligned}
\frac{x^2+2x}{x+1} &\geq 0 \\
x &> -1 \\
\end{aligned}
\right.
\]
\end{document}
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Author by
Another User
Updated on December 12, 2020Comments
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Another User almost 3 years
Beginner here, I have been trying to use Overleaf after writing on ShareLaTex but the text isn't being correctly read. This is the original code:
\left\{ \begin{array}{11} \frac{x^2+2x}{x+1} \geq 0 \\ x > -1 \\ \end{array} \right.
And this is the error I get:
LaTeX Error: Illegal character in array arg. See the LaTeX manual or LaTeX Companion for explanation. Type H <return> for immediate help. ... l.43 \begin{array}{11}
What did I do wrong?
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Troy almost 6 yearsWelcome to TeX.SE! It's
ll
, not11
.l
, as inleft-align
.
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