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"If there would be no God then what a staff-captain am I?" said one of the characters in a novel by Dostoevskii. In a similar way we can exclaim: "If there would be no nonlinearity than what physics would that be'?." Really, the most interesting and exciting effects are described by non linear equations, and vanish in the linear approximation. For example, the general theory of relativity by A.Einstein comes to mind first - one of the most beautiful physical theories, which is in fact essentially nonlinear. Next, the phase transitions crystal liquid and liquid gas are due to the anhar...

"If there would be no God then what a staff-captain am I?" said one of the characters in a novel by Dostoevskii. In a similar way we can exclaim: "If there would be no nonlinearity than what physics would that be'?." Really, the most interesting and exciting effects are described by non linear equations, and vanish in the linear approximation. For example, the general theory of relativity by A.Einstein comes to mind first - one of the most beautiful physical theories, which is in fact essentially nonlinear. Next, the phase transitions crystal liquid and liquid gas are due to the anhar...