Hi Aditya,
 
I've copied your codes and replaced the original ones with them, but I failed when I make the formats:
texexec --make --all
 
It gives me the following message:
---------------------------------------------------

(d:\ConTeXt\usr\local\context\tex\texmf-local/tex/context/base/math-pln.tex
! Undefined control sequence.
\@@toks ->\everymathematics
                           
\dodoappendtoks ->\dodoglobal \@@toks
                                      \@EAEAEA {\@EA \the \@EA \@@toks \the ...
l.382     \to \everymathematics
                              
? q
OK, entering \batchmode

ConTeXt  ver: 2006.12.20 23:52 MK II  fmt: 2006.12.27  int: dutch/dutch

fonts           : needs map file: texnansi-public-lm
fonts           : needs map file: original-base
fonts           : needs map file: ec-public-lm
fonts           : needs map file: ec-base
fonts           : needs map file: lm-ec
! Missing \endcsname inserted.
<to be read again>
                   \@@ladefault
\defaultlanguage #1->\@EA \ifx \csname \??la #1
                                               \c!default \endcsname \empty ...

\defaultlanguage ...\??la #1\c!default \endcsname
                                                  \fi
\dogetupsometextprefix #1#2#3->\ifcsname #2#1
                                             #3\endcsname \csname #2#1#3\end...

\labeltexts #1#2->\leftlabeltext {#1}
                                     #2\rightlabeltext {#1}
<argument> ...enumber {\pageprefixes \pagenumber }
                                                  \@@nmright
...
l.38 \protect \errorstopmode \dump
                                   \endinput
? q
OK, entering \batchmodeTeXExec | generating tex format mptopdf

----------------------------------------------------------

On 12/27/06, Aditya Mahajan <adityam@umich.edu> wrote:
On Tue, 26 Dec 2006, Sanjoy Mahajan wrote:

> I just noticed this test file failing:
>
> \starttext
> $f'(x)$
> \startformula
> f^\prime(x)\quad f'(x)
> \stopformula
> \stoptext
>
> It gives:
>
> ! Undefined control sequence.
> l.4 f^\prime(x)\quad f'
>                        (x)
>

This is a typo in math-pln.tex. The end of the file should be

\bgroup
    \catcode`\_ = 13
    \catcode`\' = 13
    \doglobal\appendtoks
        \let_\activemathunderscore
        \let'\activemathquote
    \to \everymathematics %<--- was \everymath
\egroup

Aditya
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--
Sincerely yours,
Chen
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