Looking for a command for this calligraphic phi
(\varphi is not the same and \mathcal{\varphi} does not work).
Solutions working under mathjax are more preferred.
1 Answer
It seems to be not a phi, but rather an L for me. On http://detexify.kirelabs.org/classify.html, I found this solution:
\documentclass{article}
\usepackage{mathrsfs}
\begin{document}
$\mathscr{L}$
\end{document}
This also works in MathJax: $\mathscr{L}$
(Tried here: https://www.mathjax.org/#demo)
\mathscr{L}also works with MathJax.