On Mon, Jan 20, 2020 at 12:58 PM Alan Grayson <[email protected]> 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. > *> 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. 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/CAJPayv1BL_P1fRfMd4dxQvGu-OE%3DDcVm%2BcFDsFZVzdrirYJ4ow%40mail.gmail.com.
