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On the basis of the Pad\'e approximant method we deduce from the exact series expansions for the Ising model that the reduced magnetic susceptibility behaves at the critical point as ₅₂₂0. 09923{ (0. 101767-w) }^5{4}, ₁₂₂0. 152773{ (0. 1561789-w) }^5{4}, ₒ₂0. 22138{ (0. 218156-w}^5{4}, ₓ0. 2432{ (2-3-w) }^7{4}, ₒₐ0. 35724{ (2-1-w) }^7{4}, and ₇0. 4506{ (1{3-w) }}^7{4}, where w=tanh (JkT) and the last figure quoted is somewhat uncertain. The spontaneous magnetization is found to behave as ({I₀{I_}) }₅₂₂12. 5 (0. 664658-{z^2) }^0. 3, ({I₀{I_}) }₁₂₂10. 4 (0. 5326607-{z^2) }^0. 3, ({I₀{I_}) }ₒ₂10. 9 (0. 411940-{z^2) }^0. 3, where z=exp (-2JkT) and again the last place quoted is somewhat uncertain. The numbers 54 and 74 have an error of at most 10^-3, and 0. 3 of at most 10^-2. The lattices referred to are fcc, face-centered cubic; bcc, body-centered cubic; sc, simple cubic; t, triangular; sq, simple quadratic; and h, honeycomb.
George A. Baker (Wed,) studied this question.