On Monday, January 20, 2020 at 1:47:49 PM UTC-7, John Clark wrote: > > On Mon, Jan 20, 2020 at 12:58 PM Alan Grayson <[email protected] > <javascript:>> wrote: > > >> Are you talking about spatial curvature or spacetime curvature? >>> >> >> *> I think the former, but I am unclear about the difference between the >> cases. There might not be a difference. AG* >> > > Of course there is a difference! People had worked out the mathematics for > non-Euclidian spatial curvature by the early 18th century, but nobody knew > anything about spacetime curvature and how it relates to physics before > Einstein. >
I meant the definition of curvature for space-time is certainly different, but I'm not sure how this difference relates to what I've conjectured. AG > > >> *> You might never return due to the rate of expansion being temporarily >> faster than light, but I think the universe would still be closed. AG* >> > > Then Universe, Closed Universe, and Open Universe would all mean the same > thing. But they don't. > Not the same. There would still be a difference between a sphere and a plane. AG > > John K Clark > -- 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/a5012908-12c7-4f9b-9e81-04dcc14e0847%40googlegroups.com.
