On Sunday, January 8, 2017 at 10:14:32 AM UTC+1, Marc Mezzarobba wrote:
>
> Simon King wrote:
> > Wouldn't it be better to [...] or change the
> > arithmetic operations by *avoiding* a call to __init__()?
>
> That's what the branch I pointed to tries to do, to some extent at
> least. But the st
Simon King wrote:
> Wouldn't it be better to [...] or change the
> arithmetic operations by *avoiding* a call to __init__()?
That's what the branch I pointed to tries to do, to some extent at
least. But the structure of generic polynomial classes (with many
operations implemented in an abstract
Hi Marc,
On 2017-01-07, Marc Mezzarobba wrote:
> Another trick you can use if you are creating the polynomial rings
> yourself and only need to do basic arithmetic is to define them by
>
> PolynomialRing_field(base, var, element_class=Polynomial_generic_dense)
>
> instead of PolynomialRing(base,
Nils Bruin wrote:
> polynomial aritmetic over ZZ and QQ is so much more optimized than
> over number fields,
Yes, polynomial arithmetic over number fields is painfully slow. The
branch trac:u/mmezzarobba/speed_up_generic_polynomials (not fully tested
yet) may help a little.
Another trick you ca
On 5 January 2017 at 20:01, Nils Bruin wrote:
> On Thursday, January 5, 2017 at 11:27:05 AM UTC-8, John Cremona wrote:
>>
>> > I'm tempted to say: beware of memory leaks. Caching an extension on the
>> > base
>> > field would probably imply that both fields are now participating in a
>> > referenc
On Thursday, January 5, 2017 at 11:27:05 AM UTC-8, John Cremona wrote:
>
> > I'm tempted to say: beware of memory leaks. Caching an extension on the
> base
> > field would probably imply that both fields are now participating in a
> > reference cycle, anchored in the global UniqueRepresentation
On 5 January 2017 at 18:15, Nils Bruin wrote:
> On Thursday, January 5, 2017 at 2:27:06 AM UTC-8, John Cremona wrote:
>>
>> I have a degree 5 polynomial whose Galois group is large (S_5):
>>
>> sage: x = polygen(QQ)
>> sage: f = x^5 - 6*x^3 - x^2 + 6*x - 1
>>
>> I can compute its splitting field e
On Thursday, January 5, 2017 at 2:27:06 AM UTC-8, John Cremona wrote:
>
> I have a degree 5 polynomial whose Galois group is large (S_5):
>
> sage: x = polygen(QQ)
> sage: f = x^5 - 6*x^3 - x^2 + 6*x - 1
>
> I can compute its splitting field easily, thanks to code written by
> Jeroen Demeyer I
