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I know it's possible to have \xrightarrow (text), but if I try to do \xRightarrow (text) I get an error each time. Does anybody know if it's a syntax error or if there is a other way to produce the \Rightarrow with text above?

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2 Answers 2

up vote 15 down vote accepted

enter image description here

Just taking the definition of \xrightarrow and replacing r by R :

\documentclass{article}
\usepackage{amsmath}


\makeatletter
\newcommand{\xRightarrow}[2][]{\ext@arrow 0359\Rightarrowfill@{#1}{#2}}
\makeatother

\begin{document}

$\xrightarrow{hello}$


$\xRightarrow{hello}$


\end{document}
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10  
oh, please at least make that \mathit{hello} to get rid of the obnoxious math kerning. –  barbara beeton Dec 1 '12 at 19:19
    
As I posted I felt your pain but I had to dash:-) –  David Carlisle Dec 1 '12 at 20:52
\documentclass{article}
\usepackage{mathtools}
\begin{document}

$\xrightarrow{\text{hello}}$
$\xRightarrow{\text{hello}}$

\end{document}

enter image description here

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Why the difference in arrow lengths? The head of the double arrow is under "o" of hello, while "hello" is entirely above the shaft of the single arrow. –  Joshua Taylor yesterday

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