Hi,
Sorry to be a pain:
%%<tst01.tex
Inline $\sqrt{1.2}$ math. % same for $\root n of x$
\end
%%>
$ luatex --fmt luatex-plain tst01.tex
This is LuaTeX, Version beta-0.79.1 (TeX Live 2014/dev) (rev 4972)
(format=luatex-plain 2014.5.7) 7 MAY 2014 11:48
\write18 enabled.
**tst01.tex
8<....
(../tex/generic/context/luatex/luatex mplib.tex)
! Missing { inserted.
<to be read again>
$
l.2 Inline $\sqrt{1.2}$
math. %-- same for $\root n of x$
Works fine with `luatex` and `pdftex` from MacTeXbasic 2013 (+extras)
LuaTeX, Version beta-0.76.0-2013061817 (TeX Live 2013) (rev 4627)
pdfTeX 3.1415926-2.5-1.40.14 (TeX Live 2013)
Font issue with roots?
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