Hello, I want to get underbraces under matrices in a math alignment environment. I’ve reproduced my problem here:
\definemathmatrix
[pmatrix]
[left={\left(\,},right={\,\right)}]
\starttext
\placeformula[-]\startformula\startmathalignment
\NC\
A \NC=\underbrace{
\startpmatrix
\NC 5\NC 5\NR
\NC -1\NC 7\NR
\stoppmatrix}\NR
\NC\NC=\underbrace{
\startpmatrix
\NC 2\NC 1\NR
\NC 4\NC 2\NR
\stoppmatrix}\NR
\stopmathalignment\stopformula
\stoptext
How can I achieve this?
Jethro
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