How to typeset contradiction symbol?
You might add a negativ space \!
which results in no space between the two symbols:
\documentclass{article}
\begin{document}
\[
\Rightarrow\!\Leftarrow
\]
\end{document}
As @Rethliopuks noted in the comments, the package tipa
disables the usage of \!
in mathmode as negative space. If you use this package (or any other package which disables \!
) you might use
\Rightarrow\mskip-\thinmuskip\Leftarrow
instead for the same results (\mskip-\thinmuskip
is the default definition of \!
).
That gives what you want (added \!
):
\documentclass{article}
\begin{document}
\[
\Rightarrow\!\Leftarrow
\]
\end{document}