Hi, I just tried an example from math-ali.mkiv: \starttext \placeformula \startformula \startalign \NC a \NC \eq b \NR[+] \NC c \NC \neq d \NR \NC \NC \neq f \NR[+] \NC \NC \geq g \NR[+][a] \NC \NC \leq h \NR[+][b] \NC \NC \eq i \NR \stopalign \stopformula \stoptext But the subformula ...[+][a] and ...[+][b] are not shown as expected... they are shown as normal formula numbers - but they should be subformula numbers. Is there a new way to create subformulas? P.