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We consider the dynamics of N boson systems interacting through a pair potential N−1Va(xi−xj) where Va(x)=a−3V(x/a). We denote the solution to the N-particle Schrdinger equation by ΨN, t. Recall that the Gross-Pitaevskii (GP) equation is a nonlinear Schrdinger equation and the GP hierarchy is an infinite BBGKY hierarchy of equations so that if ut solves the GP equation, then the family of k-particle density matrices  solves the GP hierarchy. Under the assumption that a=N−ɛ for 0N→∞ the limit points of the k-particle density matrices of ΨN, t are solutions of the GP hierarchy with the coupling constant in the nonlinear term of the GP equation given by ∫V(x)dx. The uniqueness of the solutions of this hierarchy remains an open question.

Gross-Pitaevskii Equation as the Mean Field Limit of Weakly Coupled Bosons