# Create a lambda mirror

Could you help me please, I need a mirror lambda as the sub-indice in the picture. I tried d_{{\reflectbox{$\lambda$}}_j}´ without success.

Go to the webpage https://detexify.kirelabs.org/classify.html and draw the symbol. The classifier will tell you that it is the symbol \rightthreetimes from the amssymb packages.

\documentclass{article}
\usepackage{amsmath}% \begin{cases} ... \end{cases}
\usepackage{amssymb}% \rightthreetimes
\begin{document}
$\begin{cases} d_\rightthreetimes\geq a, d_\rightthreetimes\geq b, d_\rightthreetimes\geq c\\ a + b + c \geq 2d_\rightthreetimes\\ a + b + c \leq 2 \end{cases}$
\end{document}


You can use \mathpalette (you find several examples on the site).

\documentclass{article}
\usepackage{graphicx}

\makeatletter
\DeclareRobustCommand{\mlambda}{% mirror lambda
{\mathpalette\mlambda@\relax}%
}
\newcommand{\mlambda@}[2]{%
\reflectbox{$\m@th#1\lambda$}%
}
\makeatother

\begin{document}

$\mlambda+x_{\mlambda}$

$\lambda+x_{\lambda}$

\end{document}
`

• That looks very odd, with the serif, weight axis and italic-slant flipped as well as the strokes. Jun 23 at 12:14