I am pretty new to the subject and hope someone can give me certain links to start off. We can express the time evolutions of a quantum mechanical state of a system as : |psi(Xf,T)> = Gv(Xf,T;X0,0) |psi(X0,0)> Now Gv can be expressed as a discretized Feynman Path integral which comes out to be a pretty complex integral (equation 4 in attached file). I am unable to understand as to how should I code a program to calulate this integral. any ideas!!