Date: Apr 29, 2013 2:08 PM
Author: Rich Delaney
Subject: Re: closed universe, flat space?
On Apr 23, Nicolas Bonneel <nicolas.bonn...@wanadooooo.fr.invalid>
> > 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.
I'm a lifetime donut connoisseur, but have
yet to see a flat one.
> Same for Poincaré dodecahedron for instance etc.