I wanted to draw a long \mapsto-like arrow like this:
\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\node (sequence) at (0,0) {
$\sqrt[4]{2}
\mapsto \sqrt[4]{2}\,i
\mapsto -\sqrt[4]{2}
\mapsto -\sqrt[4]{2}\,i$
};
\draw[|->,looseness=3]
(sequence.mid east)
to[out=0,in=0] (sequence.south east)
-- (sequence.south west)
to[out=180,in=180] (sequence.mid west);
\end{tikzpicture}
\end{document}
But, that's not pretty. The head of long arrow is too small and the tail is too big.
Could you teach me how to adjust the arrow?