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<正> By applying the Fourier slice theorem,S_θ(λ)=∫_(-∞)~∞P_θ(t)e~(-iλt)=F(λcosθ,λsinθ),where P_θ(t)is aprojection of f(x,p)=(?)F(u,v)e~(i(ux+vp))dudv along lines of constant,to the Wigner operator we are naturally led toa projection operator(pure st