Eq. (7): the logical operators satisfy $U(s\,x_i)U(t\,z_j)=e^{i\pi st\delta_{ij}}U(t\,z_j)U(s\,x_i)$ (printed comma read as a product)

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Eq. (7): the logical operators satisfy $U(s\,x_i)U(t\,z_j)=e^{i\pi st\delta_{ij}}U(t\,z_j)U(s\,x_i)$ (printed comma read as a product) · Prove2Me