#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 ncohen):
Hello,
> This should really be discussed on sage-devel. Someone has originally
implemented this, and I guess he/she have had a reason for this.
True, but it would be a mistake to value a reason that we do not know more
than those we figured out ourselves. Maybe something smart may come from
sage-devel indeed, though. I hope that we will hear something different
from the frequent refusal to change things 'on principle'.
> If I am right, now we just needs to decide the name.
Yep. I concur with Frédéric's proposal of a `is_ordinal_sum` with an
optional certificate. The same is done differently for
`is_connected/connected_components`, but there at least there is no doubt
on which terminology should be used. Perhaps it's worth asking on sage-
devel too if you prefer.
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/19659#comment:51>
Sage <http://www.sagemath.org>
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