How about this:-
We can replace sign(var) with {-1, 1} in the _contains method
Any operation on the Set will be done on both -1 and 1. Final expression
we get will be a set. Then check if it is in [-oo, oo]
E.g.:- a*sign(x) + b
=> {-a, a} + b
=> {-a+b, a+b}
I tried to implement but I'm having some trouble. How to separate a SymPy
expression
into basic components? For e.g.:- a*b + c should give me a, b and c
separately
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