#19179: Chain homotopies
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Reporter: jhpalmieri | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.9
Component: algebraic | Resolution:
topology | Merged in:
Keywords: | Reviewers:
Authors: John Palmieri | Work issues:
Report Upstream: N/A | Commit:
Branch: | 07c9c4258f68999ecf4e2659890a3385c8f8aa0e
u/jhpalmieri/chains | Stopgaps:
Dependencies: #6102 |
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Comment (by jhpalmieri):
With your example, using `D = Chain Complex(C.differential(), ...)` works
better than with `C._diff`, because `C.differential()` returns a copy of
the defining data, and so modifying it won't change `C`. It can be
dangerous using hidden attributes, and the corresponding methods ought to
be safer.
If you are willing to give this a positive review, then #6101 should come
next, but neither will get merged without the other.
--
Ticket URL: <http://trac.sagemath.org/ticket/19179#comment:13>
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