On Saturday, 26 August 2023 at 00:22:39 UTC-7 Frédéric Chapoton wrote:
I propose in https://github.com/sagemath/sage/pull/36138 a sketch of
changes that would build a common polynomial ring by taking the union of
variables. This does not break too many things. Instead many doctests
checking
On Saturday, 26 August 2023 at 08:51:26 UTC-7 John H Palmieri wrote:
In principle it seems okay, but to be honest, I don't think I understand
Sage's polynomial rings. It seems like anything goes:
sage: R. = GF(2)[]
sage: S. = R[]
sage: S
sage: R.0 + S.0
x + x
Why am I
Frederic,
Magma is quite pedantic and doesn't let you do that.
> R := PolynomialRing(Integers(),2);
> S := PolynomialRing(Integers(),2);
> x1 + y1;
>> x1 + y1;
^
Runtime error in '+': Arguments are not compatible
Argument types given: RngMPolElt, RngMPolElt
However, I should also point
In principle it seems okay, but to be honest, I don't think I understand
Sage's polynomial rings. It seems like anything goes:
sage: R. = GF(2)[]
sage: S. = R[]
sage: S
sage: R.0 + S.0
x + x
Why am I allowed to construct S?
With your proposed changes, what happens in the
On Sat, Aug 26, 2023 at 10:22 AM Frédéric Chapoton
wrote:
>
> Dear all,
>
> currently, if x and y are in two different polynomial rings, one cannot
add them.
>
> I propose in https://github.com/sagemath/sage/pull/36138 a sketch of
changes that would build a common polynomial ring by taking the
On Wed, 2023-08-23 at 01:36 -0700, 'Martin R' via sage-devel wrote:
>
> Is there a way to fix this?
>
Now's an OK time to stop adding meaningless milestones to every open
ticket.
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Hi Frederic,
My opinion is that if there is a single non-ambiguous canonical
parent, then yes. In the case of polynomial rings I think that the
priority is to fix the following kind of non-commutativity in coercion
```
sage: cm = get_coercion_model()
sage: cm.common_parent(QQ['x,y'], QQ['y,x'])
Dear all,
currently, if x and y are in two different polynomial rings, one cannot add
them.
I propose in https://github.com/sagemath/sage/pull/36138 a sketch of
changes that would build a common polynomial ring by taking the union of
variables. This does not break too many things. Instead
