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For questions involving the Lagrangian formulation of a dynamical system. Namely, the application of an action principle to a suitably chosen Lagrangian or Lagrangian Density in order to obtain the equations of motion of the system.

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Question about Standard Model Lagrangian

Hi, I really like this form of the Standard Model Lagrangian, but I have a couple of questions to it. In the last line: What is $G_1$ and $G_2$? I assume they are the Yukawa couplings, but does t …