3

I looked it up on detexify but apparently it is not an inbuilt symbolenter image description here

NxtGen
  • 31

2 Answers2

7

I think the easiest way is:

\documentclass{article}
\usepackage{amsmath}

\begin{document} $X \overset{\triangle}{\longrightarrow} Y$ \end{document}

Result:

enter image description here

Blooment
  • 666
5

Like this?

\documentclass{article}

\usepackage{amsmath}

\begin{document}

[ X\xrightarrow{\enspace\smash{\raisebox{-0.2\height}{$\scriptstyle\triangle$}}\enspace}Y ]%

\end{document}

enter image description here

Bernard
  • 271,350