#16892: Function to check if a poset containt a subposet isomorphic to another
poset
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Reporter: jmantysalo | Owner:
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-wishlist
Component: combinatorics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jmantysalo/function_to_check_if_a_poset_containt_a_subposet_isomorphic_to_another_poset|
f13f2385d2b79adad5dae8282162d776bb8114bd
Dependencies: 16909 | Stopgaps:
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Comment (by ncohen):
Hello !
> As for default behaviour, I asked few mathematicians what they guess the
function would do if they only know it's name.
The current default behaviour is good, but it is what I would call "not
induced". The "induced" version would be the one in which you do not have
the call to `transitive_closure`: that's why I said that the default value
of "induced" in {{{.has_isomorphic_subposet}}} should be false. But
perhaps nobody cares about this second version.
> About posets.py vs. hasse_diagram.py: Actually I don't know. Saying
>
> {{{
> fgrep 'return self._hasse_diagram.' combinat/posets/posets.py
> }}}
>
> shows that there are 14 functions that are just wrappers to underlying
hasse_diagram -function. Should this be discussed on sage-devel -list?
Yepyep, you can ask !
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/16892#comment:14>
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