Abstract
It is shown that the ratios of certain triplet order parameters to magnetisation in honeycomb and diamond lattice Ising models can be easily calculated. Applying the star-triangle transformation reproduces the result obtained by Baxter (see ibid., vol.8, p.1797 (1975)) on the triangular lattice. The new derivation indicates that exact solutions for triplet order parameters are of only limited use as checks on series expansions.
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