#15305: Allow natural morphism between tensor products
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Reporter: tscrim | Owner: sage-combinat
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.13
Component: coercion | Resolution:
Keywords: tensor product coercion | Merged in:
Authors: Travis Scrimshaw | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: #15309 | Stopgaps:
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Comment (by nborie):
Ok, I have read your patch and it look close to I did times ago...
In fact, the good way to do this is :
- Make tensor constructor accept a tuple of module morphisms such that if
foo and bar are two morphisms between parents inheriting from
combinatorialFreeModule :
tensor( (foo, bar) ) return the module morphism from tensor(
(foo.domain(), bar.domain()) ) to tensor( (foo.codomain(), bar.codomain())
) (and doing what you think so hard)
- Use this improved constructor to return the tensor of coercions
Even I had this advise from Nicolas T., I did not implemented it this way.
I choose an approach like you do. I try to remember why but I completely
forget why I did not the nice way. The reason can be laziness from me or a
technical issue. I completely forget...
I'll try to test your patch on my stack of combinatorial Hopf algebras
this week end...
Cheers, Nicolas B.
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Ticket URL: <http://trac.sagemath.org/ticket/15305#comment:6>
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