I use newtxtext and newtxmath.

The problems are as follows:

  1. $\triangleright$ yields something like \mathcal{F}. With \show\triangleright I get \triangleright=\mathchar"2246

  2. The exclamation point doesn't show up when you type $n!$.

  • 3
    Please provide a full minimal working example which reproduces the issue, possibly starting with \documentclass{...} and ending with \end{document}. In this way we can copy-paste the code and look at the problem without resorting to wild guesses about what you are doing. – campa Mar 2 '17 at 14:44
  • 4
    In particular, do tell us which document class you use and which packages you load in addition to newtxmath and newtxtext. – Mico Mar 2 '17 at 14:51

A minimal example is:

$\triangleright$ $n!$

By removing \usepackage[mtphrb]{mtpro2}, I solved the problem.

  • 2
    The piece of information that you were loading both mtpro2 and newtxmath is absolutely crucial, and it should have been mentioned in the original query. Without this piece of information, did you expect anyone to come up with a diagnosis, let alone a cure? – Mico Mar 13 '17 at 17:57
  • How can one close a question, or suppress it when it is a silly question? – André Bellaïche Apr 22 '17 at 17:39

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