On Nov 28, 2:49 pm, Niles <[email protected]> wrote:
> I've noticed the following strange behavior (bug):
>
> sage: A.<a> = PolynomialRing(QQ)
> sage: 3 in A
> True
>
> sage: A2.<a,b> = PolynomialRing(QQ)
> sage: 3 in A2
> False
>
> So apparently "in" for multivariate polynomial rings is slightly
> broken, but I don't know where to look to fix it.
I think it's this code in sage/rings/polynomial/
multi_polynomial_ring_generic.pyx:
def __contains__(self, x):
"""
This definition of containment does not involve a natural
inclusion from rings with less variables into rings with more.
"""
try:
return x.parent() == self
except AttributeError:
return False
--
John
--
To post to this group, send an email to [email protected]
To unsubscribe from this group, send an email to
[email protected]
For more options, visit this group at http://groups.google.com/group/sage-devel
URL: http://www.sagemath.org
