#18843: Differentiable manifolds: vector fields and tensor fields
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Reporter: egourgoulhon | Owner: egourgoulhon
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-7.3
Component: geometry | Resolution:
Keywords: differentiable | Merged in:
manifold, tensor field, vector |
field, differential form |
Authors: Eric Gourgoulhon, | Reviewers: Travis Scrimshaw
Michal Bejger |
Report Upstream: N/A | Work issues:
Branch: | Commit:
public/manifolds/diff_manif_tensor_fields|
3ab0af048e9ba51f09752a02f0d6544a53ffe15e
Dependencies: #15916, #18783, | Stopgaps:
#20770 |
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Comment (by tscrim):
Replying to [comment:38 egourgoulhon]:
> Replying to [comment:37 tscrim]:
> >
> > We currently have no `differential` function, just its shorten `diff`,
which is the Sage equivalent for `derivative`. I am not opposed to having
an `xder` alias, just importing it into the global namespace (by default)
as it is not a "standard" short name. However, you could include the
import of `xder` as part of the examples/tutorials.
>
> I agree that the exterior derivative is too specialized to have it in
the global namespace of any sage session. On the other side, end users
working with differential forms may feel cumbersome to perform some import
in each of their sessions. A solution could be to modify the top function
`Manifold` so that it imports `xder` into the global namespace. Is such a
thing possible/desirable?
This is what the `init.sage` is for. It is called every time Sage is
loaded. I feel that one import to setup an environment with a convenience
function is very little to ask. IMO, it is not good for the entry point
`Manifold` to have side effects.
--
Ticket URL: <https://trac.sagemath.org/ticket/18843#comment:39>
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