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Description
There should be an automatic extension of scalars in the following situation
sage: R.<x> = LaurentSeriesRing(QQ)
sage: QQbar.gen() * x
Traceback (most recent call last):
...
TypeError: unsupported operand parent(s) for *: 'Algebraic Field' and
'Laurent Series Ring in x over Rational Field'
To be compared with
sage: R.<x> = PowerSeriesRing(QQ)
sage: QQbar.gen() * x
I*x
sage: parent(_)
Power Series Ring in x over Algebraic Field
Currently, these pushouts are allowed:
sage: x = LaurentSeriesRing(QQ, 'x').gen()
sage: y = PolynomialRing(QQ, 'y').gen()
sage: x * y
x*y
sage: parent(x * y)
Univariate Polynomial Ring in y over
Laurent Series Ring in x over Rational Field
This is inconsistent with PowerSeriesRing
.
By fixing these problems, we had to adapt some code in sage/schemes/hyperelliptic_curves/hyperelliptic_generic.py
that was using the aforementioned pushout.
Depends on #24420
Component: algebra
Author: Vincent Delecroix
Branch/Commit: 8abc33b
Reviewer: Travis Scrimshaw
Issue created by migration from https://trac.sagemath.org/ticket/24431