This paper is a Response to Professor Perk's recent Comment (arXiv:1209.0731).We point out that the singularities of the reduced free energy βf , the free energy per site f and the free energy F of the 3D Ising model differ at β = 0. The rigorous proof presented in the Perk's Comment is only for the analyticity of the reduced free energy βf, which loses its definition at β = 0. Therefore, all of his objections lose the mathematical basis, which are thoroughly disproved. This means that the series expansions cannot serve as a standard for judging the correctness of the exact solution of the 3D Ising model. Furthermore, we note that there have been no comments on the topology-based approach developed by Zhang for the exact solution of the 3D Ising model.

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