Hi,

Set notation “{}” is OK in TeX mode.

But it is missing in the output of the metafun code.

Here is an MWE.

It is same in two different versions.

ConTeXt ver: 2021.01.17 21:42 LMTX fmt: 2021.2.4 int: english/english

ConTeXt ver: 2021.03.13 11:22 LMTX fmt: 2021.3.14 int: english/english

\startbuffer[test]
label(textext("$\{a,b\}$"),origin);
\stopbuffer

\starttext
Let $A = \{a,b\}$.

\processMPbuffer[test]
\stoptext

Thanks.

Best regards,

Dalyoung