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nonequilibrium

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As you can seeh here, according to wikipedia, the Runge-Kutta methods are iterative, but I don't see what is iterative about it. As I see it, starting from a certain value of x where you know y, you calculate y at x+h, then at x+2h, etc. Where is the iteration?

first line of wiki page said:In numerical analysis, the Runge–Kutta methods are an important family of implicit and explicititerativemethods for the approximation of solutions of ordinary differential equations.