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As a follow-up on #31296 and part of Meta-ticket #30818, we create `Feature`s for gfan executables and use these features in `sage.interfaces.gfan`.
This makes Sage become fully functional even whe…
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sage-4.7.1 and magma-2.17-10 give
```
sage -t -only-optional=magma "devel/sage/sage/interfaces/magma.py"
ESC[?1034h**********************************************************************
File "/home…
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The new aim of this ticket is to add an interface to the [letterplace](http://www.singular.uni-kl.de/Manual/latest/sing_427.htm#SEC480) component of Singular, that actually goes beyond what Singular…
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We provide some cleaning and speed up to the `PolyDict` class by always enforcing keys to be `ETuple` (some parts of the code did assume that was the case). As a consequence we deprecate the usage…
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Singular has polynomial rings over function fields. However, Sage makes no use of it:
```
sage: P. = QQ[]
sage: F = P.fraction_field()
sage: type(F['x','y'])
sage: F = FunctionField(QQ,'a')
sage: …
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We construct the ring $S = \mathbb Z[x]/\langle 2x \rangle$ and observe that $3x \neq x\bmod{S}$.
```
julia> R, (x,) = PolynomialRing(ZZ, ["x"]);
julia> S, π = quo(R, [2x])
(Quotient of Multiv…
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There seems to be no way to test containment of ideals in the class MPolynomialIdeal in `sage.rings.polynomial.multi_polynomial_ideal`. One might expect the comparison operators (e.g. `I
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```
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File "src/sage/libs/giac.py", line 187, in sage.libs.giac.?
Failed example:
B.is_groebner() # optional - giacpy_sage
E…
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I'm interested in computing the 0-dimensional variety of an ideal over finite field extensions of Q. I've tried the following code both on my copy (v4.4.1) of sage and online and it produces an erro…
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The build of the GUI (`xcas`) has been disabled in the `spkg-install` to minimize the dependencies.
**Sage packages**:
* [http://webusers.imj-prg.fr/~frederic.han/xcas/sage/giac-1.2.0.13.tar.gz](ht…