Greek letters do not function inside tabular even with dollar sign

Question

I am trying to use Greek letters inside a tabular-table, but it does not work. Underneath is the sourcecode and error report. Does anyone know how to fix this?

source code (relevant source only):

\begin{tabular}{| c | c | c | c |}
\hline
Klein & Groß & Sprechweise & \LaTeX{}-Schreibweise\\
\hline
\hline
$ \alpha $ & $ \Alpha $ & Alpha & \\ 
\hline
\end{tabular}
\end{document}

Error report: ! Undefined control sequence [in line with the dollar signs]

Answer 1

As described in the comments to your question the capital version of the greek letter alpha is identical to capital a (A). Thus, there is no LaTeX command for this letter as it is already defined by A.

The set of greek letters that do not have a special command for their capital representation is Alpha (A), Beta (B), Epsilon (E), Zeta (Z), Eta (E), Iota (I), Kappa (K), Mu (M), Nu (N), Omicron (O), Rho (P), Tau (T), Upsilon (Y) and Chi (X).

To make your code compile simply replace \Alpha with A.

\documentclass{article}
\usepackage[utf8]{inputenc}

\begin{document}
  \begin{tabular}{| c | c | c | c |}
    \hline
    Klein & Groß & Sprechweise & \LaTeX{}-Schreibweise\\
    \hline
    \hline
    $ \alpha $ & $ A $ & Alpha & \\
    \hline
  \end{tabular}
\end{document}