〈 U ( β ) 〉 c 0 = 1 2 3 4 − V 2 2 1 2 − V 4 4 3 4 + V 4 8 1 2 3 4 1 2 5 6 − V 6 48 1 2 3 5 6 4 − V 6 6 1 2 3 4 5 6 + V 6 4 − V 8 8 1 2 3 4 5 6 7 8 − + 1 2 3 4 5 6 7 8 + V 8 48 1 2 3 4 5 6 7 8 + V 8 48 1 2 3 4 5 6 7 8 + V 8 4 1 2 3 4 5 6 7 8 − V 8 16 − − V 8 16 1 2 3 4 5 6 7 8 $^{+}$... + V 8 16 1 2 3 4 5 6 7 8 〈 U ( β ) 〉 c 0 normal = 1 2 3 4 3 4 − V 4 2 + V 4 2 1 2 5 6 + V 6 6 3 − V 8 4 1 2 3 4 5 6 7 8 − + − V 2 1 2 1 2 3 4 1 2 5 6 4 − V 6 3 + V 8 24 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 + V 8 8 $^{+}$... 4 − V 8 2 1 2 3 8 7 5 6 FIG. 5: Vacuum diagrams of first eight orders of perturbation theory in superconducting state. FIG. 6: Some of the vacuum diagrams in normal state of the system. uct of some contribution from G c and some one from Λ. If the contribution of G c is of n$_{1}$ order of perturbation theory and of Λ of n$_{2}$ order when the order of 〈 U ( β ) 〉 c 0 is equal to n with the condition n$_{1}$ + n$_{2}$ + 2 = n which must be satisfied. There are different possibilities to sat- isfy this condition and all of them must be taken into account. For example there are three possibilities to compose from G c and Λ the sixth diagrams of Fig. 7. These pos- sibilities are enumerated below on the Fig. 8. Other ex- 6