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From: Aditya Mahajan <adityam@umich.edu>
Newsgroups: gmane.comp.tex.context
Subject: extentable arrows
Date: Wed, 28 Jun 2006 16:56:39 -0400 (EDT)
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Hi,
  Does ConTeXt have anything equivalent to xleftarrow, xrightarrow of 
amsmath. Basically, I need a command that can do

A \xleftarrow[subscript]{superscript} B

should give

    superscript
A <----------- B
    subscript

and similar for xrightarrow, xleftrightarrow, xLeftarrow, xRightarrow 
and xLeftRightarrow.


The closest that I could come to it was (only for superscripts)

\def\xrightarrow#1{\buildrel{#1}\over\longrightarrow}

But this is not extendable.

\xrightarrow{big superscipt}


Any suggestions?

Aditya