Mastering the use of four-vectors and the "dot product" trick to solve collision and decay problems.
Spend at least one hour struggling with a problem before looking at the solution. This "struggle time" is when your brain actually learns the physics. Mastering the use of four-vectors and the "dot
3.1 The properties of the electron are:
6.2 The quark model explains the hadronic spectrum. Mastering the use of four-vectors and the "dot
