In various problems we must employ variable transformations degenerate at e ε = 0. One such example is the case of a nilpotent X0 considered in Sections 1.5 and 2.5, where a special (shearing) transformation reconstructs X so that another operator, different from X0, becomes the leading one.
KeywordsNormal Form Relaxation Oscillation Fundamental System Asymptotic Series Singular Surface
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