I want to write a text in Greek and there are some non-greek names.

I used the following code:

\begin{frame}{Ιστορική αναδρομή}
Το 1926 ο $\textenglish{David Hilbert }$ ισχυρίζεται ότι κάθε υπολογίσιμη συνάρτηση είναι πρωταρχικά αναδρομική.  $ \\ \\ $ 

I used the following package:


But I get the following error:

Undefined control sequence.
\beamer@doifinframe ...-Το 1926 ο \textenglish 
                                                  {David Hilbert } ισχυ�...
l.66 \end{frame}

The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined. 

What have I done wrong?? What could I change??

  • 2
    First question, why math mode? – Johannes_B Apr 13 '15 at 10:43
  • Do you mean why I use the $ $ ?? I tried it without them, and since it didn't work I tried it with them but it still doesn't work... @Johannes_B – Mary Star Apr 13 '15 at 10:46
  • 4
    \foreignlanguage{english}{David Hilbert} . And all this math is simply wrong. – Ulrike Fischer Apr 13 '15 at 10:47
  • When I write this instead of \textenglish{} I get exactly the same erroe as before, although I don't use \textenglish{} it says that "Το 1926 ο \textenglish {David Hilbert } ισχυ�... l.66 \end{frame}" Why?? @UlrikeFischer – Mary Star Apr 13 '15 at 10:55
  • LaTeX doesn't invent commands. If is says there is a \textenglish, it is there. So check if you saved the file, changed the right file, changed all occurances of \textenglish, etc. – Ulrike Fischer Apr 13 '15 at 10:59

Use \foreignlanguage{english}{David Hilbert}.

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