Changes

== Topology ==

== Topology ==

A '''Torus''' can be defined as the [[cartesian product]] of 2 [[circle]]s.  It can be constructed from a [[rectangle]] by identifying its opposite edges.  

A '''Torus''' can be defined as the [[cartesian product]] of 2 [[circle]]s.  It can be constructed from a [[rectangle]] by identifying its opposite edges under the [[quotiet topology]].  

This means that the torus surface is connected in the same way as the points on a rectangle, where you can “wrap-around” from one side of the rectangle to the other.  This was a common topology used in the playing field of older video games.

This means that the torus surface is connected in the same way as the points on a rectangle, where you can “wrap-around” from one side of the rectangle to the other.  This was a common topology used in the playing field of older video games.