On Feb 28, 1:02 pm, "Ken S. Tucker" wrote:
On Feb 27, 5:48 pm, xxein wrote:



On Feb 27, 8:37 pm, Tom Roberts wrote:

Ken S. Tucker wrote:
The ISU has set the signature to (++++),

That's complete and utter nonsense. No standards organization can
possibly "set" something like that -- it inherently depends on the
manifold and metric in question. In SR and GR, the metric can have
signature +++- or ---+ (order doesn't matter); there is no observable
difference between those two choices (in SR and GR).

http://physics.trak4.com/modern-spacetime.pdf
which I generally use because it's simple
and arbituary.

Referencing yourself is just downright silly.

So far as I know, General Covariance permits
any signature you want.

Then you clearly do not know enough. For a given manifold with metric,
the signature is fixed, and no diffeomorphism or change of coordinates
can change it (that's the essence of general covariance).

There are no physical
laws forcing a specific definition of the
signature.

Again, you clearly do not know enough. For GR to be applied, one must
use a metric with one of the two signatures I mentioned above -- no
others come anywhere close to providing an accurate model of the world
we inhabit.

Tom Roberts

xxein: That you know of...

xxein
Read your essay/post (twice) a few days back,
very nice.

Maybe we should start a war between those
who use Polar CS's and those who use Cartesian
CS's, it's ****ing religious ****.

Next we'll start a war between those using
(+---) against those using (-+++), that has
been going for a century.

Its' a choice, Ken. Stop kooking out over the irrelevant.


Lot's of crazies in this world.
Regards
Ken