On Sunday, July 5, 2020 at 10:59:57 AM UTC-6, Alan Grayson wrote: > > > > On Sunday, July 5, 2020 at 10:02:52 AM UTC-6, John Clark wrote: >> >> On Sat, Jul 4, 2020 at 10:55 AM Alan Grayson <[email protected]> wrote: >> >> > *tensors are inherently independent of coordinate systems* >> >> >> Yes exactly, but it's not easy to find a tensor that correctly describes >> how objects move through spacetime, and its far from obvious that such a >> tensor even exists, but it does and Einstein managed to find it. And that's >> why he's so famous. >> >> > *What has this to do with the Equivalence Principle?* >> >> >> Alan.... you just said "tensors are inherently independent of coordinate >> systems".... what is it that you think "The Equivalence Principle" means? >> >> John K Clark >> > > I stated it earlier. The EP means gravity is locally indistinguishable > from acceleration. How does one get from this insight, to > "indistinguishable from coordinate system"? The latter is always true, must > be true, if laws of physics are to exist. AG >
Do you see my point? For laws of physics to exist, they must be independent of coordinate system. I don't see what the EP has to do with this, or how Einstein used it to formulate GR. AG -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/2277fa06-507a-48dd-afe6-f8357e65197do%40googlegroups.com.
