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