I'm trying to include a caption for a figure with two subfigures with quite some math. However, I get:

Undefined control sequence

I've tried to replace the the $ with \begin{math} and \end{math} but that only gave the error:

Argument of \@caption has an extra }.



\caption{The experiments have been carried out with freestream velocity $u = 30 m/s$, 
angle of attack $\alfa = 10\degree$ and flap deflection $\delta_{f} = 32\degree$.}

  • Besides, use siunitx to format units, bith m/s and degree.
    – daleif
    Nov 6, 2013 at 14:15
  • 1
    Two comments not related directly to the problem you're looking to solve: (i) The \centering instructions inside the subfigure environments are unnecessary because the graphs take up the full width of the subfigures. (ii) You may want to instruct LaTeX to create a bit more horizontal separation between the two subfigures. You could do so by inserting the instruction \quad or, better yet, \hspace*{\fill}.
    – Mico
    Nov 6, 2013 at 14:20
  • This question appears to be off-topic because it is about a typo in a command name.
    – Joseph Wright
    Jan 29, 2014 at 21:12

1 Answer 1


Probably it is just a simple typo:

Try \alpha instead of \alfa in your caption.

  • And it was that simple... Still, thanks a lot Cv4!
    – Robert
    Nov 6, 2013 at 14:13

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