When I run latex
on the following file, it terminates successfully, and produces the expected result:
\documentclass[12pt]{article}
\usepackage{amsmath}
\usepackage[fleqn,tbtags]{mathtools}
%% \usepackage{MnSymbol}
\begin{document}
$$ x \xhookrightarrow{\gamma} y $$
\end{document}
But if I uncomment the commented-out line, I get this error:
! Undefined control sequence.
<argument> \lhook
\joinrel \relbar
l.6 $$ x \xhookrightarrow{\gamma}
y $$
?
Is there any way to get around this? (Of course, the example above does not require MnSymbol, but I do need it, along with mathtools, for what I'm working on.)
FWIW, here are the versions I have of the packages mentioned in the example:
Package: amsmath 2000/07/18 v2.13 AMS math features
Package: mathtools 2011/02/12 v1.10 mathematical typesetting tools
Package: MnSymbol 2007/01/21 v1.4 support for the MnSymbol font
Thanks!
PS: ironically enough, the only reason I have for using MnSymbol is to use its arrow definitions, as in
$$
\begin{matrix}
X & & \xrightarrow{h} & & Y \\
& {\scriptstyle f} \lhooksearrow & & \rhookswarrow {\scriptstyle g} & \\
& & Z & & \\
\end{matrix}
$$
to produce commutative diagrams like:
...whose layout I find just barely acceptable (the arrows are too short, and don't necessarily lie right on, and/or parallel to, the lines connecting their source and target symbols; the spacing between these symbols is not always the best; etc.). IOW, if there is a better way to produce diagrams like these, possibly without needing MnSymbol, please let me know. Thanks!
xy
package or usetikz
(much better look)