Nonlinear Interaction of Electromagnetic Waves with a Substance
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In analyzing systems with both continuous and discrete energy spectra, we have made sure that our equations describing polarization P, magnetization M, and current density J as substance reactions in electric fields E and magnetic fields H are nonlinear ones. This confirms that nonlinearity is peculiar to the substance. Moreover, we can affirm that all real physical systems are nonlinear. Nonlinearity provides the stability of the world surrounding us.