#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, | eb7b486c6fecac296052f980788e15e2ad1b59e4
#10193, #12895, #14516, #14722, | Stopgaps:
#13589, #14471, #15069, #15094, |
#11688, #13394, #15150, #15506 |
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Comment (by vbraun):
Replying to [comment:440 nthiery]:
> Oh yes, it smells! But not for the reason you are pointing to. What's
> bad is that the corresponding categories are constructed on startup;
Well a few categories are always going to be constructed on startup, the
majority shouldn't.
> And I precisely **want** to leave those lazy imports in the code
> Each "at_startup=True" that will be removed will be a measure of
progress.
I'm sorry, I overlooked the comment in your code that stated that you want
to get rid of those imports-on-startup. Oh, no comment? In that case I'm
sorry for not having any telepathic abilities to read your mind ;-)
> Mathematically speaking, you agree that an axiom *is* naturally tied
> to a most basic category, right? That which provides the language
> necessary to express the semantic of the axiom.
I agree that there is, mathematically speaking, always some join category
that would be the most basic. But there is no need to require Sage
developers to implement a common supercategory by hand. Of course you can,
but the whole point of this ticket is to reduce the number of categories
that you must construct by hand.
--
Ticket URL: <http://trac.sagemath.org/ticket/10963#comment:449>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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