The search for simplicity has always been an important trend of scientific activities. However, today, as it may be seen in many aspects of physics, chemistry, biology, and so on, a new trend is clear: the degree of complexity is increasing. In fact, it is true for every field where systems are operating in far-from-thermal equilibrium conditions. We saw how these systems are able to develope spontaneous self-organization processes and produce all kinds of microstructures. Hence, this justifies the statement made at the beginning, that understanding the origin of spatio-temporal order in systems far from thermal equilibrium and the mechanisms of structure formation and selection of their symmetries is a major theme of present-day research into the structures of continuous matter.
KeywordsConstitutive Relation Collective Behavior Line Defect Classical Domain Defect Population
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