How do I get straight letters while assigning variables? For a variable P, I currently use \text{P} to straighten it but syntactically speaking, it doesn't seem like the right way to do this.

  • Welcome to TeX.SE! Do you mean this: tex.stackexchange.com/questions/3415/…?
    – CarLaTeX
    Apr 2 '21 at 8:58
  • If you're not stuck to Computer (or Latin) Modern, the fourier package, based on Adobe Utopia, has an upright option which uses the French style: uppercase letters are upright, as well as lowercase and uppercase greek letters.
    – Bernard
    Apr 2 '21 at 15:28

I believe \mathrm may be what you're looking for:

\[ \mathrm{ ABC} \]

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