Bjørn Felsager, 2004
The Minkowski geometry was proposed in the first decade of the 20th century by Minkowski, based partially on work done by Einstein around special relativity.
In many ways the Minkowski geometry is similar to Euclidean geometry. While Euclidean geometry is based upon a view on symmetry that makes the circle the most symmetrical figure, in Minkowskian geometry the rectangular hyperbola is considered the most symmetrical figure. This necessitates a slightly different concept of right angles.
From here you can download: