#15161: Parent/Element relation for ChainComplex/Chain
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Reporter: vbraun | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.13
Component: algebraic | Resolution:
topology | Merged in:
Keywords: | Reviewers:
Authors: Volker Braun | Work issues:
Report Upstream: N/A | Commit:
Branch: | b2710cd06c2ef60044094f635ffb9bda29b5d45a
u/vbraun/chain_complex_parents | Stopgaps:
Dependencies: |
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Comment (by jhpalmieri):
On a quick reading of chain_complex.py:
- Do you want to add your name to the `AUTHORS` list at the top of
chain_complex.py?
- In the docstring for `ChainComplex_class`, change {{{`base_ring`}}} to
{{{``base_ring``}}}
- In the docstring for `differential`, the spaces aren't lined up right in
the indented part for `dim`. Same thing happens several other places. I
guess I ought to be able to fix issues like this and then push them to a
branch of my own. Meanwhile, I've attached a patch file with the changes.
- In `betti`, well, first, I hope we are moving toward using CHomP as much
as possible for homology computations. Given this, if we have a chain
complex over a finite field, it may be faster to CHomP to compute its
homology (hence its Betti numbers) than to use Sage to compute its
homology over `Q` (which is a little strange anyway, if the chain complex
is over a finite field). So the beginning part of the code might use the
complex's base ring by default, if it's a field, rather than using `QQ` by
default.
- I wonder if we should deprecate the method `torsion_list`. Maybe this is
more appropriate for a Sage worksheet than Sage source code; what do you
think?
I'll keep working on this.
--
Ticket URL: <http://trac.sagemath.org/ticket/15161#comment:11>
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