4

I have found in many sites that the \leadsto command produces this arrow:

enter image description here

However when I use it I get this

enter image description here

Why? How can I do to get the first one?

Here is the code producing the second version:

\documentclass{article}
\usepackage{amssymb}

\begin{document}
\[
  \leadsto
\]
\end{document}
4

David's answer covers the reason why you get a “different” \leadsto symbol. However, loading latexsym changes can also affect other symbols as it should be done after amssymb.

enter image description here

As you see, also \Join, \Box and \Diamond change their shape.

For just the \leadsto symbol, you can define it alone:

\documentclass{article}
\usepackage{amssymb}

\DeclareSymbolFont{lasy}{U}{lasy}{m}{n}
\SetSymbolFont{lasy}{bold}{U}{lasy}{b}{n}
\DeclareMathSymbol\leadsto{\mathrel}{lasy}{"3B}

\begin{document}
$\mho\Join\Box\Diamond\leadsto\sqsubset\sqsupset\lhd\unlhd\rhd\unrhd$       
\end{document}

enter image description here

4
\documentclass{article}
%\usepackage{amssymb}
\usepackage{latexsym}

\begin{document}
\[
  \leadsto
\]
\end{document}

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