All, This loses the one: \usemodule[amsl] \starttext \startformula \left( \startarray 1\\2\\3 \stoparray \right) \stopformula \stoptext And this chokes completely with the error message that follows: \usemodule[nath] \starttext \startformula \left( \startarray 1\\2\\3 \stoparray \right) \stopformula \stoptext Error message: ERROR: Undefined control sequence. --- TeX said --- <argument> \c!voorwit =\intereqnsskip \xprocesscommaitem #1,#2->\if ,#1 ,\@EA \xprocesscommaitem \else \if ]#1\@EAE... <argument> \c!voorwit =\intereqnsskip ,\c!nawit =\v!geen \xdogetparameters #1]->\xprocesscommaitem #1 ,],\@relax@ \dosetupformulas ... \getparameters [\??fm #1][#2] \else \getparameters [\??f... <argument> ...=\intereqnsskip ,\c!nawit =\v!geen ] \setvalue {\e!start nathga... ... l.746 ...!voorwit=\intereqnsskip,\c!nawit=\v!geen] So, what is the correct way to use this array command? Can someone give some examples of its use?