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The dispersion diagram for an array of square cells (side 2) with circular inclusions of radius 0.4. (a) Dispersion curves from numerics (solid lines), the asymptotic solutions from HFH theory (dashed lines) and the linear long-wave classical homogenization asymptotics are the dotted lines emerging from the origin. (b,c) Enlargements near repeated eigenvalues where the asymptotics from (2.17) are used.
