Hello All, I am trying to compile the following example (from http://wiki.contextgarden.net/Math/Display) with context: \starttext \placeformula \startformula \leqalignno{c^2 &= a^2 + b^2 &\formulanumber{a} \cr a^2 + b^2 &= c^2 &\subformulanumber{b} \cr d^2 &= e^2 &\formulanumber\cr} \stopformula \stoptext but I get the following error message: {{{ . . . tex error > tex error on line 7 in file /home/user/math-example.tex: ! Undefined control sequence <argument> ...er {a} \cr a^2 + b^2 &= c^2 &\subformulanumber {b} \cr d^2 &= e^2 &\formu... \math_both_eqalign_no_normal ...ratchtoks \crcr #2 \crcr \egroup \math_finish... l.7 d^2 &= e^2 &\formulanumber\cr} 1 \starttext 2 3 \placeformula 4 \startformula 5 \leqalignno{c^2 &= a^2 + b^2 &\formulanumber{a} \cr 6 a^2 + b^2 &= c^2 &\subformulanumber{b} \cr 7 >> d^2 &= e^2 &\formulanumber\cr} 8 \stopformula 9 10 \stoptext 11 ? }}} Am I doing something wrong? Any help would be gratefully appreciated. Thanks Mingranina ---------------------- Luatex Version: 0.98.3 ConTeXt Version: 2016.09.06 19:11 MKIV beta fmt: 2016.9.9 int: english/english