On Wed, 28 Jun 2006, Aditya Mahajan wrote:

> 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?

This is how it is defined in amsmath.sty

[EMAIL PROTECTED]
   \mathrel{\mathop{%
     [EMAIL PROTECTED]
     [EMAIL PROTECTED]@th
       \hbox{$\scriptstyle\mkern#3mu{#6}\mkern#4mu$}%
       \hbox{$\scriptstyle\mkern#3mu{#7}\mkern#4mu$}%
       \copy\z@
     }%
     \hbox [EMAIL PROTECTED]@}}%
   \limits
     [EMAIL PROTECTED]
                        #7\if0#2\else\mkern#2mu\fi}}%
     [EMAIL PROTECTED]
                        #6\if0#2\else\mkern#2mu\fi}}}%
}
[EMAIL PROTECTED] [EMAIL PROTECTED]
[EMAIL PROTECTED] [EMAIL PROTECTED]

I tried to contextify this, but keep on getting missing $ errors.

Aditya
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