#14537: Composition of morphisms
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Reporter: tfeulner | Owner: nthiery
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.10
Component: categories | Resolution:
Keywords: composition, morphisms | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Changes (by tfeulner):
* status: new => needs_review
Old description:
> The following code leads to a TypeError
>
> {{{
> sage: F.<a> = GF(4)
> sage: x = F.Hom(F).identity()
> sage: z = F.hom([a])
> sage: a = (z*x)
> sage: x*a
> }}}
>
> The question is could these type checking be relaxed in
> categories.morphism.IdentityMorphism.
New description:
The following code leads to a TypeError
{{{
sage: F.<a> = GF(4)
sage: f = F.Hom(F).identity()
sage: g = F.hom([a])
sage: h = (g*f)
sage: f*h
}}}
The problem is solved by relaxing the type checking in the multiplication
procedure.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14537#comment:1>
Sage <http://www.sagemath.org>
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