Re: Spacetime Questions for Mr. Bielawski, Mr. McCullough, Dr. Roberts, and Others Interested
- From: "Dirk Van de moortel" <dirkvandemoortel@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 31 Oct 2006 09:32:38 GMT
"sal" <pragmatist@xxxxxxxxxx> wrote in message news:pan.2006.10.31.08.17.23.330370@xxxxxxxxxxxxx
On Mon, 30 Oct 2006 22:54:19 -0800, Koobee Wublee wrote:
On Oct 30, 10:21 am, "Koobee Wublee" <koobee.wub...@xxxxxxxxx> wrote:
On Oct 30, 12:48 pm, sal <pragmat...@xxxxxxxxxx> wrote:
Since the curvature depends on the second partials of the metric, and
the metric [Minkowski] you just described is constant, then in the
region covered by that metric the manifold is flat.
Yup, and I'd go on to add that a tensor which is zero in any coordinate
system is zero in all of them.
And I'd also add that the standard meaning of the term "curved" in a forum
devoted to relativity is that the Riemann tensor is nonzero. But perhaps
K-W has decided to redefine "curvature" just so he can claim everyone else
is "wrong".
Koobee Afarensis also thinks that the surface of a sphere
is flat:
http://users.telenet.be/vdmoortel/dirk/Physics/Fumbles/FlatSphere.html
Dirk Vdm
.
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