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5. By time discretization of the delta function in eq. (8) we have $$\partial \left( {\dot f\left( x \right)} \right) \sim \int {\prod\limits_j {d\lambda _j \prod\limits_j {exp\left[ {i\varepsilon \lambda _i \tfrac{{f\left( {t_j } \right) - f\left( {t_{j - i} } \right)}}{\varepsilon }} \right]} } } $$ .