Hello,
since I changed to version 4.3.2 it seems that calling associated_primes() on
an ideal of a polynomial ring that has term order 'invlex' is broken.
Example:
sage: R.=PolynomialRing(QQ,2,order='invlex')
sage: R.ideal(x).associated_primes()
? // Not implemented for this ordering, please cha
Hello,
I found that if my (multivariate) polynomial ring has coefficients from a
number field, then with certain monomial orders (such as 'deglex')
I don't get the expected result when applying the reduce method of an ideal
onto a polynomial.
Example:
sage: var('X')
sage: K.=NumberField(X^2-2)
That sort of gets my expressions nicer. It doesn't quite solve the issue with
the computation time but works for now.
Would it be too difficult to have such fractions normalized automatically to
some normal form, e.g. monic denominator polynomial, if the coefficient ring is
a field?
Thanks,
St
Hi,
I'm working with fraction fields of multivariate polynomials ring with
coefficients in Q. My question is, how do I get cancellation between
numerator and denominator coefficients to work?
Example:
R.=PolynomialRing(QQ, 2)
F=FractionField(R)
f=(x/2)/(y/2)
My question is, how do I get the r
xpect that factoring
just x is also implemented? Maybe it's also just a bug.
If I replace the definition of the ring R by
R.=PolynomialRing(QQ,3)
then all four examples work correctly.
Stefan
Am 28.11.2009 um 17:17 schrieb William Stein:
> On Sat, Nov 28, 2009 at 3:06 PM, St
Hello,
I would like to factor multivariate polynomials that have parameters
in the coefficient field, for example:
K.=PolynomialRing(QQ,1)
K=FractionField(K)
R.=PolynomialRing(K,2)
Now I would like to factor elements in R, such as x^2-m^2*y^2, which
actually works. However, when I ask to hav
That helps for now.
Thanks,
Stefan
Am 15.09.2009 um 22:19 schrieb Nils Bruin:
>
> On Sep 15, 6:24 pm, Stefan Boettner wrote:
>> Hello,
>>
>> I'm trying to parse symbolic expressions, but got stuck very quickly.
>>
>> If I say:
>> (x^2).opera
Hello,
I'm trying to parse symbolic expressions, but got stuck very quickly.
If I say:
(x^2).operator()
I get:
If I say:
pow
I also get:
But if I say:
(x^2).operator()==pow
I get:
False
How do I properly test if the topmost operation of an expression is a
power, product, sum, whatever?
S
