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  • This doesn't work for me. Latex complains that \nuparrow is undefined? Commented Mar 7, 2011 at 13:03
  • And you used BOTH packages in this example, and have a fully updated LaTeX installation Commented Mar 7, 2011 at 13:07
  • yes. I have texlive installed on Fedora. I copied your code verbatim; both packages are installed. Commented Mar 7, 2011 at 13:13
  • I have found a sort of hack using the xy package. I don't know any metafont but I can't imagine it's that hard to define an upward arrow with a line through it? Commented Mar 7, 2011 at 13:21
  • Which mathtools version? Note that several Linux dists. are very slow at updating their LaTeX. This is why I always use the one from TUG, an update it manually with the build in manager. That was I KNOW I have the latest versions, I don't have to wait for some lazy dist. manager. Commented Mar 7, 2011 at 13:36