Hi,
Finally, after reading source code of math-ali.mkiv, I found the best
way to typeset my multiline equation as follows
\starttext
\placeformula
\startformula
\startalign[n=3]
\NC x^2 + y^2 \NC = z^2 \NC \NR[eq:1]
\NC\NC = w^2 \NC + u^2\NC \text{(by \in{Equation}[eq:2])} \cr
\NC\NC + v^2 + r^2 \NR[eq:2]
\NC\NC\NC + v^2 + r^2 \NR[eq:3]
\NC\NC = v^2\NC + r^2 \NR[eq:4]
\stopalign
\stopformula
\stoptext
but I don't know what is going on here. Exactly, eq:2 and eq:3 has the
same output but they can not be interchanged. Can someone explain this code?
MO
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