Comment #4 on issue 3653 by [email protected]: solve does not return
zero roots when solving a system of equation
http://code.google.com/p/sympy/issues/detail?id=3653
"The solution (a, b) = (-c, -c) includes (0,0), (1,1) ... all values where
a == b"
THIS WOULD MEAN THAT WE HAVE INFINITE SOLUTIONS AND THIS IS NOT TRUE !!!
c is a (fixed) parameter. For c=1 the solutions for (a,b) are given by the
set [(-1,-1),(0,0)]=[(-c,-c),(0,0)], because c=1.
For ANOTHER value of the symbolic parameter c substitute that value.
We always have 2 (maybe coincident) solutions, not infinite solutions !
SO the bug exists because (0,0) as a solution is not returned and the
solutions are not in a consistent format !
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