Hi, the first \vdots in the third row is not centered.
\starttext \definemathmatrix[mymatrix][matrix:parentheses] \startformula \startmymatrix \NC A_1 \VL B_1 \NR \HL \NC \vdots \VL \vdots \NR \NC \vdots \NC \vdots \NR % there is probably something from here \HL \NC A_n \VL B_n \NR \stopmymatrix \stopformula \stoptext https://wiki.contextgarden.net/Matrix_in_maths#Other_formatting_example ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror) archive : https://github.com/contextgarden/context wiki : https://wiki.contextgarden.net ___________________________________________________________________________________