Is it possible that hg/ mercurial was used in the past and now it is git?
Yesterday, I successfully checked out with git.
For more information:
http://code.google.com/p/sympy/wiki/SympyDevelopment
Yes, that's right, we use git now, and have for some time. It even
says "This is outdated, it's recommended to use git." See the Source tab,
and
http://ondrejcertik.blogspot.com/2008/08/i-am-switching-from-mercurial-to-git.html
and
http://ondrejcertik.blogspot.com/2008/12/experience-with-git-after-4-months.html.
I don't think anybody even released that this page was still here with hg.
I guess I should take some time to update it.