#20669: LatticePoset: add function to get all sublattices
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Reporter: jmantysalo | Owner:
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-7.3
Component: combinatorics | Resolution:
Keywords: latticeposet | Merged in:
Authors: Jori Mäntysalo | Reviewers: Travis Scrimshaw
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jmantysalo/all_sublattices | 1bb87bd775eece24a586b9ccedb7dfd6ca0b5488
Dependencies: | Stopgaps:
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Comment (by tscrim):
Replying to [comment:6 jmantysalo]:
> Replying to [comment:5 tscrim]:
> > Replying to [comment:4 jmantysalo]:
> > > Of course I can change this to use backtracking, but... Then why not
move this to static sparce graphs class, if we really want as fast code as
possible?
> >
> > I have no inherent objects to this, but does the static sparse digraph
code have the capacity to do the meet and joins?
>
> No, but that could be added. Or actually copied from current file. For
Frattini sublattices that would actually make sense.
However, meet and join doesn't quite make sense to have it there
mathematically AFAIK. Although by cythonizing `hasse_diagram.py`, we
should get most of possible speed without doing really much in the way of
changes.
> Basic questions about all reviews: 1) Is Sage better with this or
without? 2) If with, is there some ''easy'' steps to make it still better?
I am going to treat this as you telling me ''your'' process for reviewing.
Otherwise I would take that a very insulting comment to me which you are
telling me how to do ''my'' review.
--
Ticket URL: <http://trac.sagemath.org/ticket/20669#comment:7>
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