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function addcode (codetext)
{
document.formular.formel.value += codetext;
document.formular.formel.focus();
}

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\[
\sigma _i  = \left\{ {\begin{array}{*{20}c}
   {\left( {\begin{array}{*{20}c}
   0 & 1  \\
   1 & 0  \\
\end{array}} \right);\;i = 1}  \\
   {\left( {\begin{array}{*{20}c}
   0 & { - i}  \\
   i & 0  \\
\end{array}} \right);\;i = 2}  \\
\end{array}} \right.
\]

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\array{\wedge \\ =}