stereographic projection. Riemann sphere
http://plus.maths.org/content/category/tags/stereographic-projection-riemann-sphere
enMaths in a minute: The Riemann sphere
http://plus.maths.org/content/maths-minute-riemann-sphere
<p>If you walk around the two-dimensional plane you can keep walking indefinitely in all directions. You could say, in a very hand-wavy and intuitive sense, that there is infinity all around the edge of the plane, only of course you can never get to or see that edge. But still, you could try to imagine what happens if you shrink that infinity-edge to a point. Perhaps this would be a little like tightening the draw string on the rim of a fabric bag. Once you've tightened it, the bag is closed and resembles a deformed sphere.</p><p><a href="http://plus.maths.org/content/maths-minute-riemann-sphere" target="_blank">read more</a></p>http://plus.maths.org/content/maths-minute-riemann-sphere#commentsstereographic projection. Riemann sphereTue, 01 Oct 2013 09:06:58 +0000mf3445946 at http://plus.maths.org/content