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For MathJax, the following might be useful, \substack puts the symbols over each other, \textstyle enlarges the font, \mathrel fixes the horizontal spacing: f_n\mathrel{\substack{\textstyle\rightarrow\\\textstyle\dashrightarrow}} f Result image from MathJax Live Demo: But it would look quite ugly in LaTeX: \longrightarrow would be better, ...


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You could accomplish this with tikz: \documentclass{article} \usepackage{tikz} \begin{document} \[ f_n\; \tikz{\draw[dashed, ->] (0,0) -- ++(0.35cm, 0);\draw[->] (0,0.125cm) -- ++(0.35cm,0);}\; f \] \end{document} Or make it a macro: \documentclass{article} \usepackage{tikz} \newcommand{\stackedarrow}{\ensuremath{\;}\tikz{\draw[dashed, ->] ...



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