Math delimiters across math alignment environments

Math delimiters across math alignment environments

[Jairo A. del Rio]

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Hi dear list! I have a question about the use of delimiters.
There are commands as \left ... \right which allow delimiters of variable
size, but they are usually asymmetrical. AFAIK, ConTeXt has mechanisms of
the form \definemathfence[something][something][command=yes]. My question
is: is it possible to make math fences work in a math alignment, e.g.

\definemathfence[something][brace][command=yes]
\startformula
\startmathalignment[n=2,align={middle,middle}]
%This won't work (I didn't expected to work, anyway)
\NC \NC \something{\frac{1}{2} +  \NR
\NC \NC x} \NR
\stopmathalignment
\stopformula

so that the fences are the same size? Thank you in advance. Stay safe.

Jairo <3

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