Howdy folks,
I'm a very new to sympy, and am stumped by the following error.
Considering the following code snippet:
from sympy import *
print sympy.__version__
#'0.7.4.1-git'
epsilon,beta = var("epsilon,beta",positive=True)
(exp(epsilon*beta) - 1).is_positive # is None
Sympy knows that beta and epsilon are positive, but seems not to know that
the exponential function takes positive quantities to quantities greater
than one. Is there a workaround for this issue, or is there something
fundamental to sympy's internals that makes this sort of deduction
impossible?
I checked the mailing list, stack overflow and the issue tracker, and
didn't see anything pertaining to this question, but I admit I might not
know what I'm looking for.
Thanks in advance!
Cheers,
Pat.
On Fri, Feb 7, 2014 at 12:45 PM, Patrick O'Neill <[email protected]> wrote:
> Howdy folks,
>
> I'm a very new to sympy, and am stumped by the following error.
> Considering the following code snippet:
>
> from sympy import *
> print sympy.__version__
> #'0.7.4.1-git'
> epsilon,beta = var("epsilon,beta",positive=True)
> (exp(epsilon*beta) - 1).is_positive # is None
>
> Sympy knows that beta and epsilon are positive, but seems not to know that
> the exponential function takes positive quantities to quantities greater
> than one. Is there a workaround for this issue, or is there something
> fundamental to sympy's internals that makes this sort of deduction
> impossible?
>
> I checked the mailing list, stack overflow and the issue tracker, and
> didn't see anything pertaining to this question, but I admit I might not
> know what I'm looking for.
>
> Thanks in advance!
>
> Cheers,
> Pat.
>
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