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For any integer m>0 and any real c,let f(m,c)=∑∞k=0(km+1)k-1cke-(km+1)c/k!.The identity f(m,/c=m)m=f(1,c)arises in the random graph theory.Here we present two elementary proofs of this identity:a pure combinatorial proof and a power-serial proof.This is a joint work with Linyuan Lu.