Talk:Differential geometry

where to put stuff?

Tosha suggests that this article is not the right place to talk about vectors as derivations or bundles and their sections. But it seems that there is nowhere with a sophsiticated discussion of vector fields. we need one. but where? - Lethe 00:10, Jul 17, 2004 (UTC)

I simply think that good discussion vector fields sould be in vector field, but it is totally ok to mention it here. Tosha

Yet an other pace is tangent space Tosha 20:34, 19 Jul 2004 (UTC)

"ring"

This claims that if an area preserving map of a ring twists each boundary component in opposite directions,
 then the map has at least two fixed points.

Umm, like a diamond ring? Why can't the word "cylindar" be used, if that's what is meant??

First figure

The caption for the first figure (as of Feb 1, 2016 it shows a hyperbolic triangle embedded in a hyperbolic plane) uses two terms which I think ought to be replaced: 1) it uses "plane" when the figure clearly is not a (euclidean) plane. While the modifier "hyperbolic" could be added, I suggest it would be better to substitute the word "surface" here. 2) it uses the word "immersed"; I've never seen that useage; the word suggests - to me - a depth that a surface does not possess. The better word is clearly "embedded". If the editors agree, please make the changes.216.96.79.179 (talk) 16:39, 1 February 2016 (UTC)

Assessment comment

The comment(s) below were originally left at Talk:Differential geometry/CommentsTalk:Differential geometry/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.

"Intrinsic versus extrinsic" section needs expansion; needs more on history and examples. Consider splitting article into Differential geometry and Differential topology, failing that, more material on Differential topology needed. Tompw (talk) 20:10, 1 March 2007 (UTC) Recommend splitting into into Differential geometry and Differential topology, with an overview, and non-technical introduction here. More material on Differential topology is certainly needed anyway. Geometry guy 18:31, 14 April 2007 (UTC) Split. I agree that what remains should be a gentle introduction to both fields. In addition, perhaps some modest technical details about the overlap and differences (in general terms) should also be included here. Silly rabbit 17:39, 26 April 2007 (UTC)

Substituted at 21:39, 26 June 2016 (UTC)

Space-time or spacetime?

Einstein treats spacetime as an unseparable entity. So, it's spacetime. — Preceding unsigned comment added by Koitus~nlwiki (talk • contribs) 20:53, 6 January 2020 (UTC)