Comment #80 on issue 1694 by Vinzent.Steinberg: solve has many issues with fractions
http://code.google.com/p/sympy/issues/detail?id=1694
+1 for solve() returning a set. You will use them internally for rational functions anyway, there is no point in converting them back to a list. Also, it is mathematically more correct imho. And equality checks are more intuitive, because you don't have to worry about the order of your solutions.
What happens if I do some modification locally, and use git fetch after ?
If you commit something, you will get a headless branch. Use 'git checkout -b my_branch_name' to create your own local branch. I think you can use 'git pull' to get new remote commits, but git fetch does not affect your local branch. You can use 'git merge' and 'git rebase' to update your local branch (actually 'git pull' is a combination of 'git fetch' and 'git merge').
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