## Theories of the Grand Unification

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The following lectures took place at Moscow State University.

Lecturer: K. V. Stepanyantz

### 1. The Standard Model of elementary particles and forces

The Standard Model of elementary particles and forces is built on top of the Yang-Mills non-abelian gauge theory. It makes use of the nonprime gauge group - a direct product of three prime groups $$SU(3)\times SU(2)\times U(1)$$.