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How can I do something like this

$L_1 \xrightarrow[\alpha]{\xleftarrow{\gamma}}L_2$

where both arrows are of the same length?

2
  • 1
    Is $L_1 \xleftrightharpoons[\gamma]{\alpha} L_2$ acceptable? (might need the mathtools package instead of amsmath) Aug 3, 2016 at 11:38
  • @HenriMenke Good call, but unfortunately not in this particular case. I'm trying to get that into Freeplane which - unfortuantely - does not come with mathtools (or at least I have not yet found an option that would allow me to use xleftrightharpoons).
    – User1291
    Aug 3, 2016 at 12:05

1 Answer 1

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The excellent Mathmode document explains how to make extensible arrows of all kinds (§38; pp.78-79). Here is an xleftrightarrow:

\documentclass{article}
\usepackage{mathtools, amssymb}

\makeatletter
\newcommand\xlongleftrightarrow[2][]{%
\ext@arrow 0059{\longleftrightarrowfill@}{#1}{#2}%
}
\def\longleftrightarrowfill@{%
\arrowfill@ ← \relbar → }
\makeatother

\begin{document}

\begin{equation*}
  A \xlongleftrightarrow[\quadα\quad]{γ\quadχ}B%
  \xlongleftrightarrow[\alpha]{γ} C \xlongleftrightarrow[ζ\,η\,θ\,ι\,\varkappa]{\,α\,β\,γ\,δ\,ε\,}D
\end{equation*}

\end{document} 

enter image description here

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  • Thank you. But I'd prefer two arrows to avoid ambiguity. Doesn't have to be straight arrows, if that helps.
    – User1291
    Aug 3, 2016 at 13:00
  • It seems I had misunderstood what you were asking for…
    – Bernard
    Aug 3, 2016 at 13:02
  • Perhaps the OP wants left/right harpoons? Aug 3, 2016 at 13:48
  • 1
    I really have no idea.
    – Bernard
    Aug 3, 2016 at 14:05

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