Comment #7 on issue 3635 by [email protected]: Backwards compatibility
with old assumptions
http://code.google.com/p/sympy/issues/detail?id=3635
I believe the API should be deprecated.
Apart from that, while declaring an assumption, we can have an alternate
better way.
(Tell me what you feel about this)
eg:-
(With the new assumption system)
x = Symbol('x')
fact = Q.sign(x,positive)
With this system, I feel it will be easier to tackle other issues like the
symbol being positive and negative simultaneously.
These functions can internally make .is_positive return true
and .is_negative return false.
Similarly for other assumptions which contradict each others...
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