The purturbative expressions for response function R and inverse dielectric function ε-1 has been established in the paper by using the concept of the coherent renormalization according to their primitive definition. By comparing the obtained equations with those in the MSR scheme, we pointed out that the two agree quite well in form with each other at least within the sixth order, and thus justified the reliability of the coherent renormalization. The differences between the two were analysed in more detail and its relation with DIA were also discussed.
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