The spin-spin correlation function for the S=1/2 Ising ferromagnet is evaluated in zero magnetic field and for T>~Tc by the method of series expansions. Evidence is presented showing that the scaling of correlations is valid in the (weak) limit r→∞, κr fixed, but is not valid in the (strong) limit κa→0, ra, with κr arbitrary.
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Ferer et al. (1969) studied this question.
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