Other Special Nonlinear Compact Systems
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In this chapter we present an interesting back up of the previous chapters devoted to solitons on closed free surfaces, like drops. Namely, one can predict the possibility of existence of such exotic shapes from some first geometric principles. In the frame of geometric collective models, for example, it can be shown that these types of shapes can be created through the formalism of nonlinear symmetry groups. We conclude the chapter by presenting an example of Hamiltonian structure for systems with free closed boundaries.