#18529: Topological manifolds: basics
-------------------------------------+-------------------------------------
Reporter: egourgoulhon | Owner: egourgoulhon
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-6.10
Component: geometry | Resolution:
Keywords: topological | Merged in:
manifolds | Reviewers: Travis Scrimshaw
Authors: Eric Gourgoulhon | Work issues:
Report Upstream: N/A | Commit:
Branch: | 0fb39df7fafe7f0a765bf73b3f34a6cb41e65c40
u/tscrim/top_manifolds_refactor | Stopgaps:
Dependencies: #18175 |
-------------------------------------+-------------------------------------
Comment (by egourgoulhon):
The refactoring with the new classes `AbstractObject`, `AbstractSet`,
`ManifoldSubset` and `TopologicalSubmanifold` looks good. It clarify
things, thanks! A suggestion regarding the naming: what about replacing
`AbstractObject`, which sounds too general, by `AbstractNamedObject`,
which would better reflect the class content?
Regarding the separation manifold/structure, I am wondering how this could
fit with differentiable manifolds? Since the structure classes are
singleton, they store things like the differential order but not
properties specific to a given manifold, like the set of vector frames
defined on the manifold or its module of vector fields. Then, how could
one have a single class for all kind of manifolds? For instance, the class
`DifferentiableManifold` introduced in #18783 inherits from
`TopologicalManifold` and has the additional attributes `_frames`,
`_coframes`, `_frame_changes`, `_parallelizable_parts`,
`_vector_field_modules`, etc., which have no meaning for a topological
manifold. Besides, we don't want the user to write something like `v =
M.structure().vector_frame(...)` instead of `v = M.vector_frame(...)`, do
we?
--
Ticket URL: <http://trac.sagemath.org/ticket/18529#comment:68>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac.
For more options, visit https://groups.google.com/d/optout.
