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. 
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2 Answers
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} 
- 1That looks very odd, with the serif, weight axis and italic-slant flipped as well as the strokes.leftaroundabout– leftaroundabout2022-06-23 12:14:48 +00:00Commented Jun 23, 2022 at 12:14