Comment #2 on issue 1244 by nicolas.pourcelot: (x + exp(x)).is_positive
returns True
http://code.google.com/p/sympy/issues/detail?id=1244
Infact, exp(x) + anything atomic is returned as True.
It seems to be linked to this :
>>> sympy.exp(x).is_unbounded
True
which is all right. But in Add, I found this :
def _eval_is_positive(self):
c = self.args[0]
r = Add(*self.args[1:])
if c.is_positive and r.is_positive:
return True
if c.is_unbounded:
if r.is_unbounded:
# either c or r is negative
return
else:
return c.is_positive
elif r.is_unbounded:
return r.is_positive
if c.is_nonnegative and r.is_positive:
return True
if r.is_nonnegative and c.is_positive:
return True
if c.is_nonpositive and r.is_nonpositive:
return False
why should an unbounded element give the sign of an addition ??
I have one question more :
>>> sympy.exp(x).is_finite
False
I expected it to be True or None, not False, so what does is_finite mean ?
Thanks !
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