When using the \mathbf command instead of \boldsymbol, greek symbols are not always made bold. However, when using the tufte-book document class, the beta symbol is changed into fi. What is fi and why does this happen?




Yields: enter image description here

\boldsymbol does appear to work correctly, but where does this unrelated fi come from?


1 Answer 1


That is an oddity of the mathpazo font package. For greek letters (OML encoding) you have to use \mathbold, because \mathbf switches to OT1 encoding.




enter image description here

  • 1
    what about just using the bm package? Easier to type
    – daleif
    Nov 1, 2017 at 8:57

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