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Could you tell me what is Green function for bilocal operators? As I understand from its form G(x1y1, x2y2,.......).... now the pairs of XY are considered as points instead of single X points as in normal Green function

G(x1,x2,x3.....). So What do we need it for? Or can it be decomposed into sums/products of ordinary Greens functions? Or where to read about it?

Thks

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# Green function for bilocal operatos?

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