A simple relation between three-point correlation functions is derived for two-component materials. This relation enables one to find concise expressions for the Beran, Molyneux, and McCoy bounds on transport and elastic coefficients in terms of the volume fraction, f₁, and two fundamental geometric parameters, ζ₁ and η₁. The parameter ζ₁ also determines bounds on the complex electrical permittivity. No simple interpretation of ζ₁ and η₁ has been found.
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Graeme W. Milton (1981) studied this question.
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