3. Inverse voter model(VM) It is averaged over nodes with the same degree k for bi- nomial distribution Bn.k, then they are summarized over degree distribution p(k) for the global density p. Ex ponential function in formula(1)is linearized for easier analysis before averaging. The master equation is now derived into dp 2Sp(k) dt ∑ N不[B(k+1)<n2>-28<n23>一k< 习 (2) where <. are the moments of the binomial distribu3. Inverse voter model (IVM)