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An alternative way to define \boldsymbol
\formula{\grad \eta = e^{\vec k \cdot \vec x} \unitvec{n}}
</texcode>
== An Alternate Definition ==
An alternate way to define <cmd>boldsymbol</cmd> is
<texcode>
\def\boldsymbol#1%
{\mathchoice
{\hbox{\switchtoformulabodyfont [boldmath]$#1$}}
{\hbox{\switchtoformulabodyfont [boldmath]$#1$}}
{\hbox{\switchtoformulabodyfont [boldmath,script]$#1$}}
{\hbox{\switchtoformulabodyfont[boldmath,scriptscript]$#1$}}}
</texcode>
This is slightly more efficient than the first version.
== Mixing Math Fonts ==
