A minimal working example is as follows:




Question: How to invoke \phi only from newtxmath package? Note that I don't like to invoke any other letters from newtxmath. Any help is welcome!


There you go.


\[\phi, \bm{\phi}\]



Thanks to @marmot pointing out this previous answer by @AlanMunn. As @AlanMunn said in that answer, one needs some basic knowledge about font declarations before performing the trick. This key line of code in newtxmath.sty:


tells us that we should be looking for lines that declare letters. Indeed, we find

% Math Italic %
... ... ...
... ... ...

Thus, the suggested solution.

  • 1
    It's important to find ntxmi! Although I know the method, but I didn't find ntxmi!
    – M. Logic
    Oct 2 '18 at 11:37
  • Very kind Ruixi...marmot not exist..but there's his substitute :-) Maybe you should edit the answer since there are no comments referring to the two users.
    – Sebastiano
    Dec 28 '19 at 22:42

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