The uncertainty relationship between position and momentum of the microscopic particles is calculatedby nonlinear quantum theory in which the states of the particles are described by a nonlinearSchrodinger equation. The results show that the uncertainty relation differs from that in the quantummechanics and has a minimum value in this case. This means that the position and momentum of theparticles could be determined simultaneously to a certain degree, which could be caused by the wave-corpuscle duality of the microscopic particles described by the nonlinear Schrodinger equation.
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