#10963: Axioms and more functorial constructions
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Reporter: nthiery | Owner: stumpc5
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-6.2
Component: categories | Resolution:
Keywords: days54 | Merged in:
Authors: Nicolas M. Thiéry | Reviewers: Simon King, Frédéric
Report Upstream: N/A | Chapoton
Branch: | Work issues: merge with #15801
public/ticket/10963-doc- | once things stabilize
distributive | Commit:
Dependencies: #11224, #8327, | 268345f966b19589088e9b0dc84f183e4f45f545
#10193, #12895, #14516, #14722, | Stopgaps:
#13589, #14471, #15069, #15094, |
#11688, #13394, #15150, #15506, |
#15757, #15759, #15919 |
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Comment (by nbruin):
Replying to [comment:633 pbruin]:
> - `sage.structure.CategoryObject` has a method `_refine_category_()`
whose job is exactly to place the object into what we currently call a
subcategory, but what I propose to call refinement.
That's actually a rather bad example. This method mutates category
objects, which are hashable and hence are supposed to be immutable. Worse:
they tend to be `UniqueRepresentation` and hence should ''really'' be
immutable, because unrelated code may hold a reference to the same object.
Under those circumstances the only category change that has a remote
change of not wreaking havoc is one to a subcategory in the mathematical
sense of the word. So if your interpretation of the term "refinement" is
adopted, this method would have to be renamed.
--
Ticket URL: <http://trac.sagemath.org/ticket/10963#comment:634>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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