Date: Apr 23, 2013 6:06 PM
Author: Nicolas Bonneel
Subject: Re: closed universe, flat space?
On 4/23/2013 3:23 PM, RichD wrote:
> Supposedly, our universe is closed and finite, although the
> geometry and topology isn't precisely known. This means
> a straight line (geodesic) traveler must return to his starting
> poiint, yes/no? Hence, curved space.
no - a flat torus... is flat, closed and finite, and a traveler returns
to his starting point. Same for Poincaré dodecahedron for instance etc.