#10963: More functorial constructions
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Reporter: nthiery |
Owner: stumpc5
Type: enhancement |
Status: needs_work
Priority: major |
Milestone:
Component: categories |
Resolution:
Keywords: |
Work issues: Reduce startup time by 5%. Avoid "recursion depth exceeded
(ignored)". Trivial doctest fixes.
Report Upstream: N/A |
Reviewers: Simon King
Authors: Nicolas M. Thiéry |
Merged in:
Dependencies: #11224, #8327, #10193, #12895, #14516, #14722, #13589 |
Stopgaps:
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Comment (by nthiery):
Replying to [comment:31 SimonKing]:
> Why is there a double-underscore `__neg__` method as element method of
additive groups? The reason for the single underscore arithmetic methods
is, to my understanding, to enable the coercion model. But the coercion
model is not involved in the case of `__neg__`, isn't it? Hence, I think
one should keep it double underscore, and should not ask for an
implementation via a single underscore method.
All I did is to lift this method from
"sage.structure.element.ModuleElement", as a step toward deprecating this
class.
I agree that the _neg_ feature itself is questionable (it has no purpose
besides consistency). So one could think about removing it (and fixing the
couple modules in Sage that implement _neg_). But that would require a
discussion on sage-devel and is in any cases for a different ticket.
For this ticket, do you think I should add a little comment about this in
the doc?
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10963#comment:46>
Sage <http://www.sagemath.org>
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