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Something about N-point Green's function in QFT really troubles me......

In the path-integral formalism,why will we introduce the N-point Green's function? I mean is it enough because we have calculated the 2-point green's function.

And in the canonical formalism, it seems we can finish the calculation of transition amplitude only with the help of 2-point Green's function(Wick contraction)

What are the differences?

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# N-point Green's function in QFT

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