#18529: Topological manifolds: basics
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Reporter: egourgoulhon | Owner: egourgoulhon
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.10
Component: geometry | Resolution:
Keywords: topological | Merged in:
manifolds | Reviewers:
Authors: Eric Gourgoulhon | Work issues:
Report Upstream: N/A | Commit:
Branch: | 6dec6d592a09e56921b9a761827309dd31ae2533
public/manifolds/top_manif_basics | Stopgaps:
Dependencies: #18175 |
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Comment (by tscrim):
Replying to [comment:24 egourgoulhon]:
> Regarding the user interface, we could indeed have a *function*
`Manifold` that looks like
> {{{
> Manifold(dim, symbol, type='smooth', ...)
> }}}
> with `'topological'`, `'differentiable'`, `'smooth'` as possible values
for the parameter `type` (as well as `'analytic'`, etc. in the future). A
question: should `'smooth'` be the default value?
I don't know how easy it would be to make this a check on the atlas used
to construct the manifold. I would make it select it automatically if
possible, and then default to the most general setting of `'topological'`.
> Besides, I remember someone was complaining that `Manifold` was already
used in !SnapPy, cf. [http://www.math.uic.edu/t3m/SnapPy/manifold.html
this page], but is there any danger of name clash? i.e. is !SnapPy used
(or could be used in the future) from Sage?
I would then add an additional argument of `implementation`, which would
default to the native Sage implementation, if there does become a name
clash and have the constructor delegate out to the !SnapPy version when it
exists in Sage (IDK if it is Sage now or not).
--
Ticket URL: <http://trac.sagemath.org/ticket/18529#comment:25>
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