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## Main Question or Discussion Point

i find that most books on green's function are burdened with too much formalism

i am now reading the book by Rammer, which deals with non-equilibrium physics.

The formalism is so lengthy and so confusing. You have to strive hard to remenber the various green's fucntions, and only to find that there is little concrete applications.

I am haunted with the puzzle: the idea of a closed contour seems very naive, and how this trick can solve non-equilibrium physics?

I still cannot biuld a picture of the green's function

i am now reading the book by Rammer, which deals with non-equilibrium physics.

The formalism is so lengthy and so confusing. You have to strive hard to remenber the various green's fucntions, and only to find that there is little concrete applications.

I am haunted with the puzzle: the idea of a closed contour seems very naive, and how this trick can solve non-equilibrium physics?

I still cannot biuld a picture of the green's function