#18263: reintroduce `__neg__` for magmas cartesian product
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Reporter: vdelecroix | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.7
Component: categories | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies: #16836
Stopgaps: |
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In #16836 the `__neg__` operation for cartesian product was moved from
`AdditiveMagmas` to the `AdditiveMagmas.WithInverse()`. The operation was
ambiguous but the feature is lost. It should be decided in this ticket
what should be done with it.
One should also restore the `TODO` section about `NN` being lazily import
(or fix it ;-)
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Ticket URL: <http://trac.sagemath.org/ticket/18263>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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