Hi Andrey,

On Feb 13, 4:30 pm, Andrey Novoseltsev <novos...@gmail.com> wrote:
> Hello,
>
> While writing an enhancement proposal 
> onhttp://trac.sagemath.org/sage_trac/ticket/10777
> I thought that it could be convenient to create a (finite) poset
> without specifying its elements but perhaps adding them one-by-one as/
> if they are created later.
>
> It seems to me that it is not possible to create such posets in Sage
> now, is it?
>
> Is it actually of any interest to anyone or my situation was too
> specific? (I want to create polytopes which are faces of other
> polytopes without necessarily constructing the whole face lattice.)

I might be interested in such a thing -- I'm working on a project
which uses posets, although I haven't (yet) needed to add elements.
Could one work around this by simply creating a new poset with the
elements from the old one and also the new elements?  I guess this
would be problematic if there is a lot of overhead in creating the
poset in the first place -- is that the case in your application?

As further support, I guess I would point out that lists and
dictionaries both allow one to append new elements, so I think it
makes sense for posets to have this functionality too.  If you open a
ticket for this, cc me too (I'm 'niles' on Trac) :)

-Niles

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