Yang-Mills theory is a fundamental framework in theoretical physics that generalizes the concept of gauge symmetry. It is named after the physicists Chen-Ning Yang and Robert Mills, who introduced the theory in 1954. The theory is an indispensable part of the Standard Model of particle physics, which describes the electromagnetic, weak, and strong interactions.
Here are key points about Yang-Mills theory:
1. **Gauge Symmetry**: At its core,


