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I was trying to insert a label into a node in the tikzpicture environment and I found that some math fonts are recognized while others are not. For example, node {$\mathcal{R}$} works fine but when I try node {$\mathbb{R}$} or node {$\mathfrak{R}$}, I get 'undefined control sequence' error.

How can I insert math expressions involving these fonts as labels into tikzpicture?

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  • 2
    Please give some examples in code we can compile. Jul 21 at 16:35
  • Have you loaded the amssymb package? Jul 21 at 17:56
  • you would have exactly the same error if you used those commands without tikz, the question isn't related to tikz at all. Jul 21 at 18:31
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Picture of three Rs working fine

\documentclass{amsart}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\node at (0,0) {$\mathcal{R}$};
\node at (1,0) {$\mathbb{R}$};
\node at (2,0) {$\mathfrak{R}$};
\end{tikzpicture}
\end{document}

You probably don't have the required fonts loaded; they seem to load automatically in the amsart document class. Try \usepackage{amsfonts} or \usepackage{amssymb} in your document's preamble.

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  • Yes, that was indeed the reason, thank you.
    – S.Z.
    Jul 21 at 16:44

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