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ndung200790

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In Quantum Mechanics the Heizenbeg principle holds for one particle.In QTF Theory,the creation and annihilation operators corresonding to coefficients of Fourier components of transformation,so it seem that each quantum(particle) has a definite momentum.Then it seem that the uncertainty principle holds for inter-particles(many particles),but not for single particle.If it is true,where is the role of Quantum Mechanics in Quantum Field Theory?

Thank you very much in advance.