Comment #5 on issue 1950 by andy.ter...@gmail.com: Piecewise((x, 0 < x), (0, Eq(x, 0)), (-x, x < 0))._eval_interval(x, -1, 1) is wrong
http://code.google.com/p/sympy/issues/detail?id=1950
If you ignore the subinterval (oo, Eq(x, 0) then the miss its the contribution to the interval.
Piecewise((x, 0 < x), (oo, Eq(x, 0)), (-x, x < 0))._eval_interval(x, -1, 1) == 1 not 0
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