#16851: Implement direct sum and tensor products for chain complexes and Koszul
complexes
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Reporter: tscrim | Owner: tscrim
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.4
Component: algebraic | Resolution:
topology | Merged in:
Keywords: | Reviewers:
Authors: Travis Scrimshaw | Work issues:
Report Upstream: N/A | Commit:
Branch: | 01158352cb6751e7286023c3031ad1120fa3cca1
u/tscrim/koszul_complexes | Stopgaps:
Dependencies: |
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Comment (by tscrim):
Replying to [comment:5 jhpalmieri]:
> Before it gets used, `zero` is redefined by `zero = matrix(R, [])`,
isn't it?
*facepalm*
> > Importing them at the top-level makes the call to the function faster
>
> Just for the first call, right?
No, every call. If we lazily import them, then its only on the first call.
However this is moot because...
> > However we can lazy import the `koszul_complex.py` module, which we
should do since I feel that it's not likely too many people will use this.
>
> Sounds good.
...it will only get imported (into the module's scope) when the lazy
import gets resolved.
--
Ticket URL: <http://trac.sagemath.org/ticket/16851#comment:6>
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