what I showed is the squared 4 momentum when you use the Minkowski metric [1], assuming "squared" means "self-dot product". The formulation above is just anothe

what I showed is the squared 4 momentum when you use the Minkowski metric [1], assuming "squared" means "self-dot product". The formulation above is just another way to illustrate the Minkowski dot product. [1]: https://en.wikipedia.org/wiki/Minkowski_space#Minkowski_metric https://en.wikipedia.org/wiki/Minkowski_space#Minkowski_metr...