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Heteroclinic connections between nonconsecutive equilibria of a fourth order differential equation. (English) Zbl 1031.34043
Summary: Assuming that $$f$$ is a potential having three minima at the same level of energy, we study for the conservative equation $u^{iv}-g(u)u'' \tfrac 12 g'(u){u'}^2 + f'(u) = 0\tag{1}$ the existence of a heteroclinic connection between the extremal equilibria. Our method consists in minimizing the functional $\int_{-\infty}^{+\infty} \left[\tfrac 12 [({u''}^2) + g(u){u'}^2] + f(u) \right] dx$ whose Euler-Lagrange equation is given by (1), in a suitable space of functions.

##### MSC:
 34C37 Homoclinic and heteroclinic solutions to ordinary differential equations 37J45 Periodic, homoclinic and heteroclinic orbits; variational methods, degree-theoretic methods (MSC2010)
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