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After Feynman formulation's of quantum mechanics, he expressed the propagator in function of path integral by this formula:

$G(x,t;x_i,t_i)=\int\int exp{\frac{i}{\hbar}\int_{t_i}^{t}L(x,\dot{x},P)dt'}DxDp$

the question is how we can define the integral measure Dx and Dp?

thanks