Abstract We study a prototype, dissipative-dispersive equation; ut+a(um)x+(un)xxx = μ(uk)xx, a, μ = consts., which represents a wide variety of interactions. At the critical value k = (m + n) 2 which separates dispersive- and dissipation-dominated phenomena, these effects are in a detailed balance and the patterns formed do not depend on the amplitude. In particular, when m = n + 2 = k + 1 the equation can be transformed into a form free of convection and dissipation, making it accessible to analysis. Both bounded and unbounded oscillations as well as solitary waves are found. A variety of exact solutions are presented, with a notable example being a solitary doublet. For n = 1 and a = (2μ 3) 2 the problem may be mapped into a linear equation, leading to rational, periodic or aperiodic solutions, among others.
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