#10963: More functorial constructions
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Reporter: nthiery | Owner: stumpc5
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.1
Component: categories | Resolution:
Keywords: days54 | Merged in:
Authors: Nicolas M. Thiéry | Reviewers: Simon King, Frédéric
Report Upstream: N/A | Chapoton
Branch: | Work issues:
public/ticket/10963 | Commit:
Dependencies: #11224, #8327, | 8045aa4a4b7ada735b3eb6055382f9b341a39f1e
#10193, #12895, #14516, #14722, | Stopgaps:
#13589, #14471, #15069, #15094, |
#11688, #13394, #15150, #15506 |
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Comment (by vbraun):
Replying to [comment:403 SimonKing]:
> This model relies on the observation that you ''must'' have an additive
and a multiplicative magma among the super categories, if you want to have
distributivity: Their join is the most basic category that can carry this
axiom.
Yes, and a stand-alone axiom class would be the ideal place to implement a
`is_applicable_to(category)` method that could be implemented exactly as
you say. And as implementer you don't have to figure out what that join is
to find the right place for your code.
--
Ticket URL: <http://trac.sagemath.org/ticket/10963#comment:407>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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