Thanks Taco, this workaround works for me: \Umathfractiondelsize\textstyle = 12.12pt \Umathfractiondelsize\displaystyle = 28.68pt Lutz 2009/7/3 Taco Hoekwater

Lutz Haseloff wrote:

...

Hi Hans, Hi Taco, Hi all,

a couple of days ago I complained about not adapted delimiters around constructions with \atopwithdelims. With LuaTeX, Version beta-0.41.0-2009070222 (Web2C 2009), this problem persists. After reading the last luatexref-t.pdf I tried following:

\starttext \Ustartmath\Ustack {a \atopwithdelims() b}\Ustopmath \startformula \Ustack {a \overwithdelims[] b} \stopformula \stoptext

This is a known problem. Sorry I missed your message earlier. The details of this problem are here:

http://tracker.luatex.org/view.php?id=206

Best wishes, Taco

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