Derivation of low-temperature expansions for Ising model. VIII. Ferromagnetic and antiferromagnetic polynomials for the honeycomb-triangular system

For pt.VII see ibid., vol.8, no.9, p.1441 of 1975. The principle of partial code balance and the property of latent symmetry of the honeycomb-triangular code system are used to derive five new ferromagnetic polynomials psi 17 up to psi 21 for both the triangular and honeycomb lattices. For the honeycomb lattice the corresponding antiferromagnetic polynomials up to psi 21 a are also derived.