Re: problem with math: "\left" leads to "udefined symbol" --solved (sort of)

["j. van den hoff" <veedeehjay@gmail.com>]

well after incrementally deleting most everything from my document I now  
seem to have a reproducible example:

8<--------------------------------------------
\definesynonyms[MySymbol][MySymbols][\meaning]
    \MySymbol [whaever] {this} {  means }

\starttext
\startformula
x = \left ( 1 + 2 \right )
\stopformula
\stoptext
8<--------------------------------------------

the apparent "culprit" is the presence of the `\definesynonyms' stuff.  
without it the rest (identical to your minimal example) compiles. with it  
it does not... remember that I am really unexperienced with `context': at  
the time (2 years ago), when I first tried this, it worked. I now realize  
(after reading up on the `definesynonyms' syntax again ...) that
in the definition a _command_ has to go into the third bracket. seemingly  
at the time I was just putting a placeholder `\meaning' there (never  
attempting to use it as a command acting on the explanatory text for that  
symbol definition but only wanting a glossary.

the strange thing (for me) is that this worked just fine two years ago,  
now it does produce a very strange error as described. question is why.

but replacing `\meaning' by `\infull' suffices to restore sane behaviour.


while I understand, that I did something stupid (putting a non-existent  
command `\meaning' in the definition), I would have presumed that this  
might trigger an error at that place rather than making `\left (' suddenly  
an undefined control sequence. any explanation what is going on here would  
be greatly appreciated.



On Tue, 24 Jan 2017 15:02:38 +0100, Hans Hagen <pragma@wxs.nl> wrote:

>  this just works here ... so can others confirm it?
>  \starttext
>  \startformula
>     x =  \left ( 1 + 2 \right )
> \stopformula
>  \stoptext


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