Response to arXiv:0811.1802 "Comment on 'Conjectures on exact solution   of three-dimensional (3D) Ising lattices'" by Perk and Singularities at/near   infinite temperature: Reply to Perk's Rejoinder arXiv:0901.2935
  Part I: The error of eq. (15b) in my article [Z.D. Zhang, Phil. Mag. 87, 5309 (2007), arXiv:0705.1045] in the application of the Jordan-Wigner transformation does not affect the validity of the putative exact solution, since the solution is not derived directly from it. Other objections of Perk's Comment arXiv:0811.1802v2 are the same as those in Wu et al's Comments arXiv:0811.3876 and arXiv:0812.2837, which do not stand on solid ground and have been rejected in the previous Response arXiv:0812.2330. The conjectured solution can be utilized to understand critical phenomena in various systems, while the conjectures are open to prove rigorously. Part II: This is a Reply to Perk's Rejoinder arXiv:0901.2935. It is shown that the basis of the objections in Perk's Rejoinder, with respect to singularities at/near infinite temperature, is based on an error that mixes the concepts of T approaching infinite and T = infinite. It is shown that the reduced free energy per site f can be used only for finite temperatures (beta > 0), not for 'exactly' infinite temperature (beta = 0). At the thermodynamic limit N approaches infinite, besides infinite-temperature zeros of Z at z = -1 for H = +/- i infinite in the limit of beta approaching zero, there exists another singularity at z = 1 for the partition function, which is usually concealed in literature by setting Z to the power of 1/N and dividing the total free energy F by N (equally, disregarding the singularity of zeros of 1/Z. The objections in Perk's Rejoinder are thoroughly disproved. 
Z.D. Zhang