I find it a bit surprising that ConTeXt gives 'missing } inserted'
with:
\starttext\startformula
\mathop=^{\rm def}
\stopformula\stoptext
(\mathop{=}^... is fine, though).
The above formula is correct in Plain (Lua)TeX (in fact, it is
copied from The TeX Book). Why does ConTeXt need braces?
(Before you point it out: I know that I should use \stackrel…)
Nicola
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