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One would be surprised if Nature had made no use of it. P.A.M. Dirac According to some dictionaries, one meaning of the notion of beauty is symmetry . Probably, beauty is not entirely in the eye of the beholder . It seemstoberelatedtothesymmetryoftheobject.Fromaphysicalviewpoint, this de?nition is very attractive: it allows us to describe a central concept of theoretical physics over the last two centuries as being a quest for higher symmetry of Nature. The more symmetric the theory, the more beautiful it looks. Unfortunately, our imperfect (at least at low-energy scale) world is full of...

An introduction to integrable and non-integrable scalar field models, with topological and non-topological soliton solutions.

One would be surprised if Nature had made no use of it. P.A.M. Dirac According to some dictionaries, one meaning of the notion of beauty is symmetry . Probably, beauty is not entirely in the eye of the beholder . It seemstoberelatedtothesymmetryoftheobject.Fromaphysicalviewpoint, this de?nition is very attractive: it allows us to describe a central concept of theoretical physics over the last two centuries as being a quest for higher symmetry of Nature. The more symmetric the theory, the more beautiful it looks. Unfortunately, our imperfect (at least at low-energy scale) world is full of...