The Rich Structure of Minkowski Space
  Minkowski Space is the simplest four-dimensional Lorentzian Manifold, being topologically trivial and globally flat, and hence the simplest model of spacetime--from a General-Relativistic point of view. But this does not mean that it is altogether structurally trivial. In fact, it has a very rich structure, parts of which will be spelled out in detail in this contribution. This will contain elementary aspects of affine spaces, various paths to the Poincare group, the lattices of causally and chronologically complete regions, and last but not least, the Noether-Herglotz theorem. 
Domenico Giulini