#17693: mutable poset: a data structure for asymptotic expressions
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Reporter: dkrenn | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.5
Component: misc | Resolution:
Keywords: asymptotics | Merged in:
Authors: Daniel Krenn | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/dkrenn/asy/mutable_poset | e2f884f56743c7d8780586c4b04b3d2e8242ce73
Dependencies: | Stopgaps:
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Comment (by dkrenn):
Replying to [comment:8 ncohen]:
> Could you also explain what "shells" are, and how they differ from the
'facade' boolean argument of Posets ?
There are similarities between shells and facades, but a facade is
something in Sage that represent other things and again uses
parents/elements (thus immutable). It has well-defined properties and
there is even a category for facade sets.
The shells in the mutable poset are more like a container for the
elements. Ideally a user of the poset does not need them at all (and only
a few MutablePoset-methods use them). They are only used inside the poset-
algorithms.
At one point I thought about making shells and the related methods
private, but never did this...
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Ticket URL: <http://trac.sagemath.org/ticket/17693#comment:11>
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