#19659: Poset: inverse function of ordinal_sum()
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Reporter: jmantysalo | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-7.0
Component: combinatorics | Resolution:
Keywords: poset | Merged in:
Authors: Jori Mäntysalo, | Reviewers: Nathann Cohen, Jori
Nathann Cohen | Mäntysalo
Report Upstream: N/A | Work issues:
Branch: public/19659 | Commit:
Dependencies: | 1385d69b99c5060821463ef513b0478a062db942
| Stopgaps:
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Comment (by jmantysalo):
Replying to [comment:57 ncohen]:
> What do you want us to compare in the naming of this function and the
content of #19123?
These two functions do exactly same thing when they return a Boolean
value. So should they have same name? OTOH when returning non-boolean
values it is somewhat strange to return posets that are actually
semilattices from decomposition of lattice.
> > A suggestion: What if I only make a function whose name starts with
`_`? Then we could use the code to build more functions, and think later
about the name.
>
> Then that means that the function will not appear to the users, and that
we will not even use it ourselves at the moment. I don't see the point.
It could be a building block for series-parallel decomposition.
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Ticket URL: <http://trac.sagemath.org/ticket/19659#comment:58>
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