I wrote \mathbb{R^2} in the editor, however what gets printed in the pdf is the turnstile symbol in the exponent instead of 2.

I have the following packages:


The other numbers are also replaced by logical symbols.

  • 3
    \mathbb{R}^2 is the correct syntax
    – egreg
    Commented Sep 8, 2020 at 14:18
  • Thanks a lot ! Haven't used LateX in a while !!
    – Asinus
    Commented Sep 8, 2020 at 14:20
  • 1
    Not relevant to your question, but amssymb automatically loads amsfonts, so you don't need the penultimate line. Commented Sep 9, 2020 at 9:24

2 Answers 2


The manual of amsfonts specifies that \mathbb should only be used with capital letters.

What happens when other characters are in the argument of \mathbb is almost random.

Type \mathbb{R}^2, which is more sensible also on a semantic point of view.

The problem would present also with \mathcal.


You probably don’t actually want a blackboard-bold numeral 𝟚 here. There is one in Unicode, so in unicode-math, your code would do exactly what you said.

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