![](https://secure.gravatar.com/avatar/27c34cb91f1e92bd850fe60b3d9ef336.jpg?s=120&d=mm&r=g)
9 Nov
2016
9 Nov
'16
4:46 p.m.
Hi, the \definefontsize and \definefontalternative redefine the \tf (and \it etc.) command and you can’t use it in math to get \mathtf. \starttext \begingroup \meaning\tf \endgroup \begingroup \definefontsize[e] \meaning\tf \endgroup \begingroup \definefontalternative[md] \meaning\tf \endgroup \stoptext Wolfgang