Abstract
Recently, Holmes found that the behavior of Duffing's equation with negative stiffness can be studied profitably via its approximate Poincaré section which takes the form of a two-dimensional antisymmetric cubic map. We have pursued the study of its universal metric properties. A renormalization-group calculation shows that its bifurcation ratio is the same as that for the Hénon map. We have also studied the one-dimensional cubic map and found that its bifurcation ratio is the same as the quadratic map, thus answering in the affirmative a recent question raised by May.

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