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× G c α$_{5}$$_{α$_{6}$}$(5 , 6 | V ) 〈 T f − α$_{1}$ 1 f α$_{2}$ 2 f − α$_{3}$ 3 f α$_{4}$ 4 f − α$_{5}$ 5 f α$_{6}$ 6 〉 ir 0 . from V we shall obtain the other property: 

From Fig. 3 and Fig. 10 it is possible to demonstrate the following equation: 

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If we take into account only the explicit dependence of the functional Y ′ of interaction constant V without consid- ering the dependence of the full Green’s functions G $^{c}$( V ) 

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Because of the necessity to have the functional derivatives over mass operator Σ we shall use the Dyson equation (15) rewritten in the form [ x = ( α, x , σ, τ )]: 

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