Simulate Zero Coupon Bond Using Chen's Model

    
Define Chen's model for the evolution of interest rates:
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Visualize few trajectories using the stochastic Runge-Kutta method, making sure to correct the artifact of getting negative interest rates resulting from the use of an approximate simulation method:
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Evaluate zero-coupon bond maturing at time 1 using Monte Carlo. It is given by the mean of process .
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