This is what I am doing:
>>> from sympy import *
>>> x = Symbol("x",ispositive=True)
>>> y = Symbol("y",isnegative=True)
>>> min(x,y)
x
>>> max(x,y)
y
>>> min(y,0)
0
>>> max(y,0)
y
I'm guessing that SymPy views the symbols x and y as formal variables,
e.g., formal variables for creating a ring of multivariate polynomial,
for which a lexicographical ordering would be appropriate. However, I
intend the symbols x and y to be indeterminate real numbers, e.g., as
stand-ins for particular real values which do not happen to be known
at the present time, and for which only mathematically correct
simplifications of min and max are appropriate.
How can I make SymPy do what I want?
Thanks,
Mark
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