#17000: how to use SetMorphism?
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Reporter: elixyre | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.4
Component: categories | Resolution:
Keywords: morphism | Merged in:
Authors: Jean-Baptiste Priez | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by nthiery):
This is a known limitation which has been annoying for a while: at the end
of Map.__call__, it's systematically checked that the parent of the result
is the codomain of the map. In particular, the result should be an
Element.
In other words, Map does not play well with facade parents, especially if
the elements are plain Python objects.
I think there is a ticket about this, but I don't remember which from the
top of my head.
Nice ticket number by the way :-)
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Ticket URL: <http://trac.sagemath.org/ticket/17000#comment:1>
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