#15331: Do not try to create embedded number field morphisms for non-embedded
number fields
------------------------+---------------------------------
Reporter: SimonKing | Type: defect
Status: new | Priority: major
Milestone: sage-5.13 | Component: number fields
Resolution: | Report Upstream: N/A
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The attempt to create an embedded number field morphisms for non-embedded
number fields currently fails (and should of course fail).
{{{
sage: L.<i> = NumberField(x^2 + 1)
sage: K = NumberField(L(i/2+3).minpoly(), names=('i0',),
embedding=L(i/2+3))
sage: from sage.rings.number_field import number_field_morphisms
sage: number_field_morphisms.EmbeddedNumberFieldMorphism(R, self)
Traceback (most recent call last):
...
RuntimeError: maximum recursion depth exceeded in __instancecheck__
}}}
However, instead of running into an infinite recursion, a quick and simple
`ValueError` (or perhaps `TypeError`) should be raised.
--
Ticket URL: <http://trac.sagemath.org/ticket/15331>
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