\begin{notation}% Passing the option "old" to the notation environment will redefine the notationtabular environment so that it produces an old style LaTeX tabular instead of a booktabs.sty style tabular.
  \centering

  \begin{notationtabular}{Några mängder}{Notation}{Betydelse}
    $\naturals$ & Mängden av naturliga tal \\
    $\reals$ & Mängden av reella tal \\
    $\complexes$ & Mängden av komplexa tal \\
  \end{notationtabular}

  \begin{notationtabular}{Abbreviations}{Abbreviation}{Description}
    \abbrARMA\index{ARMA@\abbrARMA!abbreviation} & Auto-regressive moving average \\
    \abbrPID\index{PID@\abbrPID!abbreviation} & Proportional, integral, differential (regulator) \\
    \abbrDUT\index{DUT@\abbrDUT!abbreviation} & Device Under Test \\
  \end{notationtabular}
\end{notation}
